# Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches

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## Abstract

**:**

## 1. Introduction

## 2. Theory

## 3. Ground State Geometry Optimization

## 4. Method of Calculation

## 5. Results and Discussion

## 6. Other Prospective Polyatomic Molecules for EDM Measurements

## 7. Conclusions

## Author Contributions

## Funding

## Institutional Review Board Statement

## Informed Consent Statement

## Data Availability Statement

## Acknowledgments

## Conflicts of Interest

## References

- Landau, L. On the conservation laws for weak interactions. Nucl. Phys.
**1957**, 3, 127131. [Google Scholar] [CrossRef] - Ballentine, L.E. Quantum Mechanics: A Modern Development; World Scientific: Singapore, 1998; Volume 384386, Chapter 13; pp. 372–373. [Google Scholar]
- Luders, G. Proof of the TCP Theorem. Ann. Phys.
**2000**, 281, 1004. [Google Scholar] [CrossRef] - Hoogeveen, F. DESY Reports 1990; DESY: Hamburg, Germany, 1990; pp. 6–90. [Google Scholar]
- Pospelov, M.; Ritz, A. CKM benchmarks for electron electric dipole moment experiments. Phys. Rev. D
**2014**, 89, 056006. [Google Scholar] [CrossRef] [Green Version] - Kazarian, A.M.; Kuzmin, S.V.; Shaposhnikov, M.E. Cosmological lower bound on the EDM of the electron. Phys. Lett. B
**1992**, 276, 131. [Google Scholar] [CrossRef] [Green Version] - Fuyuto, K.; Hisano, J.; Senaha, E. Toward verification of electroweak baryogenesis by electric dipole moments. Phys. Lett. B
**2016**, 755, 491. [Google Scholar] [CrossRef] [Green Version] - Schiff, L.I. Measurability of nuclear electric dipole moments. Phys. Rev.
**1963**, 132, 2194. [Google Scholar] [CrossRef] - Sandars, P.G.H. The electric-dipole moments of an atom II. The contribution from an electric-dipole moment on the electron with particular reference to the hydrogen atom. J. Phys. B
**1968**, 1, 511. [Google Scholar] [CrossRef] - Abe, M.; Gopakumar, G.; Hada, M.; Das, B.P.; Tatewaki, H.; Mukherjee, D. Application of relativistic coupled-cluster theory to the effective electric field in YbF. Phys. Rev. A
**2014**, 90, 022501. [Google Scholar] [CrossRef] [Green Version] - Prasannaa, V.S.; Vutha, A.C.; Abe, M.; Das, B.P. Mercury monohalides: Suitability for electron electric dipole moment searches. Phys. Rev. Lett.
**2015**, 114, 183001. [Google Scholar] [CrossRef] [Green Version] - Skripnikov, L.V. Combined 4-component and relativistic pseudopotential study of ThO for the electron electric dipole moment search. J. Chem. Phys.
**2016**, 145, 214301. [Google Scholar] [CrossRef] [Green Version] - Skripnikov, L.V. Communication: Theoretical study of HfF
^{+}cation to search for the T,P-odd interactions. J. Chem. Phys.**2017**, 147, 021101. [Google Scholar] [CrossRef] [PubMed] [Green Version] - Andreev, V.; Ang, D.G.; DeMille, D.; Doyle, J.M.; Gabrielse, G.; Haefner, J.; Hutzler, N.R.; Lasner, Z.; Meisenhelder, C.; O’Leary, B.R.; et al. Improved limit on the electric dipole moment of the electron. Nature
**2018**, 562, 355. [Google Scholar] - Cairncross, W.; Gresh, D.N.; Grau, M.; Cossel, K.C.; Roussy, T.S.; Ni, Y.; Zhou, Y.; Ye, J.; Cornell, E.A. Precision measurement of the electron’s electric dipole moment using trapped molecular ions. Phys. Rev. Lett.
**2017**, 119, 153001. [Google Scholar] [CrossRef] [Green Version] - Kara, D.M.; Smallman, I.J.; Hudson, J.J.; Sauer, B.E.; Tarbutt, M.R.; Hinds, E.A. Measurement of the electron’s electric dipole moment using YbF molecules: Methods and data analysis. New J. Phys.
**2012**, 14, 103051. [Google Scholar] [CrossRef] [Green Version] - The NL-EDM Collaboration; Aggarwal, P.; Bethlem, H.L.; Borschevsky, A.; Denis, M.; Esajas, K.; Haase, P.A.B.; Hao, Y.; Hoekstra, S.; Jungmann, K.; et al. Measuring the electric dipole moment of the electron in BaF. Eur. Phys. J. D
**2018**, 72, 197. [Google Scholar] [CrossRef] - Vutha, A.C.; Horbatsch, M.; Hessels, E.A. Oriented polar molecules in a solid inert-gas matrix: A proposed method for measuring the electric dipole moment of the electron. Atoms
**2018**, 6, 3. [Google Scholar] [CrossRef] [Green Version] - Meyer, E.R.; Bohn, J.L.; Deskevich, M.P. Candidate molecular ions for an electron electric dipole moment experiment. Phys. Rev. A
**2006**, 73, 062108. [Google Scholar] [CrossRef] [Green Version] - Meyer, E.R.; Bohn, J.L. Electron electric-dipole-moment searches based on alkali-metal- or alkaline-earth-metal-bearing molecules. Phys. Rev. A
**2009**, 80, 042508. [Google Scholar] [CrossRef] [Green Version] - Lee, J.; Meyer, E.R.; Paudel, R.; Bohn, J.L.; Leanhardt, A.E. An electron electric dipole moment search in the X
^{3}Δ_{1}ground state of tungsten carbide molecules. J. Mod. Opt.**2009**, 56, 2005. [Google Scholar] [CrossRef] - Kudashov, A.D.; Petrov, A.N.; Skripnikov, L.V.; Mosyagin, N.S.; Isaev, T.A.; Berger, R.; Titov, A.V. Coupled-cluster study of radium monofluoride, RaF, as a candidate to search for P- and T,P- violation effects. Phys. Rev. A
**2014**, 90, 052513. [Google Scholar] [CrossRef] [Green Version] - Skripnikov, L.V.; Petrov, A.N.; Mosyagin, N.S.; Titov, A.V.; Flambaum, V.V. TaN molecule as a candidate for the search for a T,P-violating nuclear magnetic quadrupole moment. Phys. Rev. A
**2015**, 92, 012521. [Google Scholar] [CrossRef] [Green Version] - Sunaga, A.; Prasannaa, V.S.; Abe, M.; Hada, M.; Das, B.P. Enhancement factors of parity- and time-reversal-violating effects for monofluorides. Phys. Rev. A
**2018**, 92, 040501(R). [Google Scholar] [CrossRef] [Green Version] - Fazil, N.M.; Prasannaa, V.S.; Latha, K.V.P.; Abe, M.; Das, B.P. RaH as a potential candidate for electron electric-dipole-moment searches. Phys. Rev. A
**2019**, 99, 052502. [Google Scholar] [CrossRef] - Kozyryev, I.; Hutzler, N.R. Precision measurement of time-reversal symmetry violation with laser-cooled polyatomic molecules. Phys. Rev. Lett.
**2017**, 119, 133002. [Google Scholar] [CrossRef] [PubMed] [Green Version] - Augenbraun, B.L.; Lasner, Z.D.; Frenett, A.; Sawaoka, H.; Miller, C.; Steimle, T.C.; Doyle, J.M. Laser-cooled polyatomic molecules for improved electron electric dipole moment searches. N. J. Phys.
**2020**, 22, 022003. [Google Scholar] [CrossRef] - Gaul, K.; Berger, R. Ab initio study of parity and time-reversal violation in laser-coolable triatomic molecules. arXiv
**2018**, arXiv:1811.05749. [Google Scholar] [CrossRef] [Green Version] - Denis, M.; Haase, P.A.B.; Timmermans, R.G.E.; Eliav, E.; Hutzler, N.R.; Borschevsky, A. Enhancement factor for the electric dipole moment of the electron in the BaOH and YbOH molecules. Phys. Rev. A
**2019**, 99, 042512. [Google Scholar] [CrossRef] [Green Version] - Prasannaa, V.S.; Shitara, N.; Sakurai, A.; Abe, M.; Das, B.P. Enhanced sensitivity of the electron electric dipole moment from YbOH: The role of theory. Phys. Rev. A
**2019**, 99, 062502. [Google Scholar] [CrossRef] [Green Version] - Calvert, J.G.; Lindberg, S.E. Mechanisms of mercury removal by O
_{3}and OH in the atmosphere. Atm. Environ.**2005**, 39, 3355. [Google Scholar] [CrossRef] - Goodsite, M.E.; Plane, J.M.C.; Skov, H. A theoretical study of the oxidation of HgO to HgBr
_{2}in the troposphere. Environ. Sci. Technol.**2004**, 38, 1772. [Google Scholar] [CrossRef] - Ezarfi, N.; Benjelloun, A.T.; Sabor, S.; Benzakour, M.; Mcharfi, M. Theoretical investigations of structural, thermal properties and stability of the group 12 metal M(XH) isomers in atmosphere: M=(Zn, Cd, Hg) and XH=(OH, SH). Theory Chem. Acc.
**2019**, 138, 109. [Google Scholar] [CrossRef] - Lindroth, E.; Lynn, B.W.; Sandars, P.G.H. Order α
^{2}theory of the atomic electric dipole moment due to an electric dipole moment on the electron. J. Phys. B At. Mol. Opt. Phys.**1989**, 22, 559. [Google Scholar] [CrossRef] - Das, B.P. Aspects of Many-Body Effects in Molecules and Extended Systems; Mukherjee, D., Ed.; Springer: Berlin/Heidelberg, Germany, 1989; p. 411. [Google Scholar]
- Kozlov, M.G. New limit on the scalar P,T-odd electron-nucleus interaction. Phys. Lett. A
**1988**, 130, 426. [Google Scholar] [CrossRef] - Chai, J.D.; Head-Gordon, M. Long-range corrected hybrid density functionals with damped atom-atom dispersion corrections. Phys. Chem. Chem. Phys.
**2008**, 10, 6615–6620. [Google Scholar] [CrossRef] [Green Version] - Hay, P.J.; Wadt, W.R. Ab initio effective core potentials for molecular calculations: Potentials for the transition metal atoms Sc to Hg. J. Chem. Phys.
**1985**, 82, 270. [Google Scholar] [CrossRef] - Wadt, W.R.; Hay, P.J. Ab initio effective core potentials for molecular calculations: Potentials for main group elements Na to Bi. J. Chem. Phys.
**1985**, 82, 284. [Google Scholar] [CrossRef] - Hay, P.J.; Wadt, W.R. Ab initio effective core potentials for molecular calculations: Potentials for K to Au including the outermost core orbitals. J. Chem. Phys.
**1985**, 82, 299. [Google Scholar] [CrossRef] - Pritchard, B.P.; Altarawy, D.; Didier, B.; Gibson, T.D.; Windus, T.L. New Basis Set Exchange: An Open, Up-to-Date Resource for the Molecular Sciences Community. J. Chem. Inf. Model.
**2019**, 59, 4814. [Google Scholar] [CrossRef] - Frisch, M.J. Gaussian 16; Revision C.01; Gaussian Inc.: Wallingford, CT, USA, 2016. [Google Scholar]
- Mozhayskiy, V.A.; Krylov, A.I. ezSpectrum. Available online: http://iopenshell.usc.edu/downloads (accessed on 14 October 2020).
- Yanai, T.; Nakano, H.; Nakajima, T.; Tsuneda, T.; Hirata, S.; Kawashima, Y.; Nakao, Y.; Kamiya, M.; Sekino, H.; Hirao, K. UTCHEM—A Program for ab initio Quantum Chemistry; Goos, G., Hartmanis, J., van Leeuwen, J., Eds.; Lecture Notes in Computer Science; Springer: Berlin/Heidelberg, Germany, 2003; Volume 2660, p. 84. [Google Scholar]
- Yanai, T.; Nakajima, T.; Ishikawa, Y.; Hirao, K. A new computational scheme for the Dirac-Hartree-Fock method employing an efficient integral algorithm. J. Chem. Phys.
**2001**, 114, 6526–6538. [Google Scholar] [CrossRef] - Visscher, L.; Lee, T.J.; Dyall, K.G. Formulation and implementation of a relativistic unrestricted coupled-cluster method including noniterative connected triples. J. Chem. Phys.
**1996**, 105, 8769. [Google Scholar] [CrossRef] [Green Version] - Cizek, J. Correlation Effects in Atoms and Molecules; Advances in Chemical Physics; Lefebvre, W.C., Moser, C., Eds.; Interscience Publishers: New York, NY, USA, 1969. [Google Scholar]
- Zack, L.N.; Sun, M.; Bucchino, M.P.; Clouthier, D.J.; Ziurys, L.M. Gas-phase synthesis and structure of monomeric ZnOH: A model species for metalloenzymes and catalytic surfaces. J. Phys. Chem. A
**2012**, 116, 1542. [Google Scholar] [CrossRef] [PubMed] - Hirano, T.; Andaloussi, M.B.D.; Nagashima, U.; Jensen, P. Electronic structure and rovibrational properties of ZnOH in the ${\tilde{X}}^{2}$ A
^{′}electronic state: A computational molecular spectroscopy study. J. Chem. Phys.**2014**, 141, 094308. [Google Scholar] [CrossRef] [PubMed] - Saiz-Lopez, A.; Acuna, U.; Trabelsi, T.; Carmona-Garcia, J.; Davalos, J.Z.; Rivero, D.; Cuevas, C.A.; Kinnison, D.E.; Sitkiewicz, S.P.; Roca-Sanjuan, D.; et al. Gas-phase photolysis of Hg(I) radical species: A new atmospheric mercury reduction process. J. Am. Chem. Soc.
**2019**, 141, 8698. [Google Scholar] [CrossRef] [PubMed] - Cremer, D.; Kraka, E.; Filatov, M. Bonding in mercury molecules described by the normalized elimination of the small component and coupled cluster theory. ChemPhysChem
**2008**, 9, 2510. [Google Scholar] [CrossRef] [PubMed] [Green Version] - Saue, T. Relativistic hamiltonians for chemistry: A primer. ChemPhysChem
**2011**, 12, 3077. [Google Scholar] [CrossRef] - Jensen, H.J.A.; Bast, R.; Saue, T.; Visscher, l. A Relativistic Ab Initio Electronic Structure Program. Available online: https://www.researchgate.net/publication/315699001DIRAC16DIRACarelativisticabinitioelectronicstructureprogramReleaseDIRAC162016 (accessed on 14 October 2020).
- Mitra, R.; Prasannaa, V.S.; Sahoo, B.K.; Tong, X.; Abe, M.; Das, B.P. Mercury hydroxide as a promising triatomic molecule to probe P,T-odd interactions. arXiv
**2019**, arXiv:1908.07360, unpublished. [Google Scholar] - Dyall, K.G. Relativistic double-zeta, triple-zeta, and quadruple-zeta basis sets for the 5d elements Hf–Hg. Theor. Chem. Acc.
**2004**, 112, 403. [Google Scholar] [CrossRef] - Dyall, K.G.; Gomes, A.S.P. Revised relativistic basis sets for the 5d elements Hf-Hg. Theory Chem. Acc.
**2010**, 125, 97. [Google Scholar] [CrossRef] - Dyall, K.G. Relativistic double-zeta, triple-zeta, and quadruple-zeta basis sets for the light elements H-Ar. Theory Chem. Acc.
**2016**, 135, 128. [Google Scholar] [CrossRef] - Wang, S.C. On the asymmetrical top in quantum mechanics. Phys. Rev.
**1929**, 34, 243. [Google Scholar] [CrossRef] - Kivelson, D. A (K + 2)nd order formula for asymmetry doublets in rotational spectra. J. Chem. Phys.
**1953**, 21, 536. [Google Scholar] [CrossRef] - Polo, S.R. Energy levels of slightly asymmetric top molecules. Can. J. Phys.
**1957**, 35, 8. [Google Scholar] [CrossRef] - Khriplovich, I.B.; Lamoreaux, S.K. CP Violation Without Strangeness; Springer: Berlin/Heidelberg, Germany, 1997. [Google Scholar]
- Sawyer, B.C.; Lev, B.L.; Hudson, E.R.; Stuhl, B.K.; Lara, M.; Bohn, J.L.; Ye, J. Magnetoelectrostatic trapping of ground state OH molecules. Phys. Rev. Lett.
**2007**, 98, 253002. [Google Scholar] [CrossRef] [PubMed] [Green Version] - Hutzler, N.R.; Lu, H.; Doyle, J.M. The buffer gas beam: An intense, cold, and slow source for atoms and molecules. Chem. Rev.
**2012**, 112, 4803. [Google Scholar] [CrossRef] [Green Version] - Wu, X.; Han, Z.; Chow, J.; Ang, D.G.; Meisenhelder, C.; Panda, C.D.; West, E.P.; Gabrielse, G.; Doyle, J.M.; DeMille, D. The metastable Q
^{3}Δ_{2}state of ThO: A new resource for the ACME electron EDM search. New J. Phys.**2020**, 22, 023013. [Google Scholar] [CrossRef] - Grasdijk, O.; Timgren, O.; Kastelic, J.; Wright, T.; Lamoreaux, S.; DeMille, D.; Wenz, K.; Aitken, M.; Zelevinsky, T.; Winick, T.; et al. CeNTREX: A new search for time-reversal symmetry violation in the
^{205}Tl nucleus. arXiv**2020**, arXiv:2010.01451v1. [Google Scholar] - Jadbabaie, A.; Pilgram, N.H.; Klos, J.; Kotochigova, S.; Hutzler, N.R. Enhanced molecular yield from a cryogenic buffer gas beam source via excited state chemistry. New J. Phys.
**2020**, 22, 022002. [Google Scholar] [CrossRef] - Verma, M.; Jayich, A.M.; Vutha, A.C. Electron electric dipole moment searches using clock transitions in ultracold molecules. Phys. Rev. Lett.
**2020**, 125, 153201. [Google Scholar] [CrossRef] - Filatov, M.; Cremer, D. Relativistically corrected hyperfine structure constants calculated with the regular approximation applied to correlation corrected ab initio theory. J. Chem. Phys.
**2004**, 121, 5618. [Google Scholar] [CrossRef] - Filatov, M.; Zou, W.; Cremer, D. Calculation of response properties with the normalized elimination of the small component method. Int. J. Quant. Chem.
**2014**, 114, 993. [Google Scholar] [CrossRef]

**Figure 1.**Pictorial representation of the bent geometry of the ground state of HgOH. Our finding shows ${\theta}_{Hg-O-H}=104.{83}^{\circ}$.

**Figure 2.**The extrapolation scheme from a linear to a bent geometry, for the permanent electric dipole moment (PDM) of HgOH. The data points in blue show the finite-field coupled-cluster (FFCC) values of the PDM in a non-relativistic framework, while for those in red, the point corresponding to the linear geometry is calculated, and the one pertaining to the bent geometry is the extrapolated value. We add that the distance that we have set between the points corresponding to the linear and bent geometries on the X-axis is arbitrary.

**Table 1.**List of the optimized geometry of the ground electronic state and three low-lying excited states of HgOH from various works. The unit of bond-lengths is angstrom (Å), while that of the bond angle is degrees.

State | ${\mathit{R}}_{\mathbf{Hg}-\mathit{O}}$ | ${\mathit{R}}_{\mathit{O}-\mathit{H}}$ | ${\mathit{\theta}}_{\mathbf{Hg}-\mathit{O}-\mathit{H}}$ | Reference |
---|---|---|---|---|

Ground | 2.091 | 0.966 | 104.1 | Ref. [50] |

2.25 | 0.99 | 106.8 | Ref. [32] | |

2.181 | - | - | Ref. [51] | |

2.2079 | 0.9691 | 103.6 | Ref. [33] | |

2.2294 | 0.9633 | 104.83 | This work | |

First-excited | 3.1458 | 0.9563 | 180 | This work |

Second-excited | 2.0766 | 0.9615 | 102.5 | This work |

Third-excited | 3.5482 | 1.0095 | 81.93 | This work |

**Table 2.**Table showing the calculated ${\mathcal{E}}_{\mathrm{eff}}$ (in GV/cm) and $\mu $ (in D) values in HgOH by assuming its hypothetical linear and the actual bent geometry ground state using the Dirac–Hartree–Fock (DHF) and RCCSD methods. We also give $\mu $ values from the previous calculations using density functional theory (DFT).

Geometry | ${\mathcal{E}}_{\mathbf{eff}}$ | $\mathit{\mu}$ | ||
---|---|---|---|---|

DHF | LECC | DHF | LECC | |

From this work | ||||

Linear | 107.24 | 109.02 | 1.57 | 1.04 |

Bent | 28.01 | 28.47${}^{\u2020}$ | 3.67 | 2.43 ${}^{\u2020}$ |

From other works | ||||

1.89 [32] | ||||

1.92 [51] | ||||

1.96 [33] |

^{†}Scaled results from the DHF and LECC values of the linear geometry calculations.

**Table 3.**Contributions from the individual relativistic coupled-cluster (RCC) terms to ${\mathcal{E}}_{\mathrm{eff}}$ (in GV/cm), $\mu $ (in D), and ${W}_{s}$ (in kHz) from both the linear and bent geometries of HgOH. O denotes the operator corresponding to the properties and h.c. means hermitian conjugate. Note that for the PDM, the term corresponding to the DHF contribution also accounts for the nuclear contribution in it.

Term | ${\mathcal{E}}_{\mathbf{eff}}$ (GV/cm) | $\mathit{\mu}$ (D) |
---|---|---|

O (DHF) | 107.24 | 1.57 |

$O{T}_{1}+$h.c. | 9.50 | −0.42 |

${T}_{1}^{\u2020}O{T}_{1}$ | −2.76 | −0.15 |

${T}_{1}^{\u2020}O{T}_{2}+$h.c. | −0.38 | 0.12 |

${T}_{2}^{\u2020}O{T}_{2}$ | −4.58 | −0.11 |

**Table 4.**Contributions from different atomic orbital (AO) mixing to the DHF value of ${\mathcal{E}}_{\mathrm{eff}}$ (in GV/cm), where the AO in the left hand side is a small component AO and that in the right hand side is a large component AO. Non-zero contributions may come only from odd-parity AO mixings $\langle {\left(AO\right)}_{1}^{S}\left|\widehat{O}\right|{\left(AO\right)}_{2}^{L}\rangle ,$ where superscript S, and L stand for small component and large component AOs respectively. Results are given for both the linear and the actual bent geometry HgOH molecule.

Atom | AOs | Linear | Bent |
---|---|---|---|

Hg | ${s}_{1/2}^{S}-{p}_{1/2}^{L}$ | 378.40 | 100.11 |

${p}_{1/2}^{S}-{s}_{1/2}^{L}$ | −270.26 | −71.81 | |

${p}_{1/2}^{S}-{d}_{3/2}^{L}$ | −31.40 | −8.07 | |

${d}_{3/2}^{S}-{p}_{3/2}^{L}$ | 30.19 | 7.77 | |

${d}_{5/2}^{S}-{f}_{5/2}^{L}$ | 0.79 | 0.19 | |

${f}_{5/2}^{S}-{d}_{5/2}^{L}$ | −0.78 | −0.18 | |

O | ${s}_{1/2}^{S}-{p}_{1/2}^{L}$ | 2.78 | 1.44 |

${p}_{1/2}^{S}-{s}_{1/2}^{L}$ | −2.77 | −1.44 |

**Table 5.**Comparison of measured (ThO, HfF${}^{+}$, and YbF) and projected sensitivities (from appropriate references as given in the table) offered by different molecules for EDM experiments. For molecules where measurements are not available, the sensitivity is estimated with appropriate N, T, $\tau $, and $\eta $ values. The unit chosen for $\delta {d}_{e}$ is e-cm, while the effective electric field is given in GV/cm.

Molecule | ${\mathcal{E}}_{\mathbf{eff}}$ | $\mathit{\delta}{\mathit{d}}_{\mathit{e}}$ | Reference(s) |
---|---|---|---|

ThO | 79.9 [12] | $1.1\times {10}^{-29}$ | Ref. [14] |

HfF${}^{+}$ | 22.5 [13] | $1.3\times {10}^{-28}$ | Ref. [15] |

YbF | 23.1 [10] | $1.06\times {10}^{-27}$ | Ref. [16] |

HgOH | 28.47 | $5\times {10}^{-30}$ | This work |

HgCH${}_{3}$ | 75.07 | $2\times {10}^{-30}$ | This work |

HgCF${}_{3}$ | 60.95 | $2\times {10}^{-30}$ | This work |

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**MDPI and ACS Style**

Mitra, R.; Prasannaa, V.S.; Sahoo, B.K.; Hutzler, N.R.; Abe, M.; Das, B.P.
Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches. *Atoms* **2021**, *9*, 7.
https://doi.org/10.3390/atoms9010007

**AMA Style**

Mitra R, Prasannaa VS, Sahoo BK, Hutzler NR, Abe M, Das BP.
Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches. *Atoms*. 2021; 9(1):7.
https://doi.org/10.3390/atoms9010007

**Chicago/Turabian Style**

Mitra, Ramanuj, V. Srinivasa Prasannaa, Bijaya K. Sahoo, Nicholas R. Hutzler, Minori Abe, and Bhanu Pratap Das.
2021. "Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches" *Atoms* 9, no. 1: 7.
https://doi.org/10.3390/atoms9010007