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Franck-Condon simulation, including anharmonicity, of the photodetachment spectrum of P2H-: Restricted-spin coupled-cluster single-double plus perturbative triple and unrestricted-spin coupled-cluster single-double plus perturbative triple -F12x potential energy functions of P2H and P2H?

Franck-Condon simulation, including anharmonicity, of the photodetachment spectrum of P2H-: Restricted-spin coupled-cluster single-double plus perturbative triple and unrestricted-spin coupled-cluster single-double plus perturbative triple -F12x potential energy functions of P2H and P2H?
Franck-Condon simulation, including anharmonicity, of the photodetachment spectrum of P2H-: Restricted-spin coupled-cluster single-double plus perturbative triple and unrestricted-spin coupled-cluster single-double plus perturbative triple -F12x potential energy functions of P2H and P2H?
Geometry optimization and harmonic vibrational frequency calculations have been carried out on the ?2A? state of P2H and the ?1A? state of P2H? and the ?1A' state of P2H- using the restricted-spin coupled-cluster single-double plus perturbative triple excitation [RCCSD(T)] and explicitly correlated unrestricted-spin coupled-cluster single-double plus perturbative triple excitation [UCCSD(T)-F12x] methods. For RCCSD(T) calculations, basis sets of up to the augmented correlation-consistent polarized valence quintuple-zeta (aug-cc-pV5Z) quality were employed, and contributions from extrapolation to the complete basis set limit and from core correlation of the P 2s22p6 electrons were also included. For UCCSD(T)-F12x calculations, different atomic orbital basis sets of triple-zeta quality with different associated complementary auxiliary basis sets and different geminal Slater exponents were used. When the P 2s22p6 core electrons were correlated in these F12x calculations, appropriate core-valence basis sets were employed. In addition, potential energy functions (PEFs) of the ?2A? state of P2H and the ?1A? state of P2H? were computed at different RCCSD(T) and UCCSD(T)-F12x levels, and were used in variational calculations of anharmonic vibrational wavefunctions, which were then utilized to calculate Franck-Condon factors (FCFs) between these two states, employing a method which includes allowance for anharmonicity and Duschinsky rotation. The photodetachment spectrum of P2H? was then simulated using the computed FCFs. Simulated spectra obtained using the RCCSD(T)/aug-cc-pV5Z and UCCSD(T)-F12x(x = a or b)/aug-cc-pCVTZ PEFs are compared and found to be essentially identical. Based on the computed FCFs, a more detailed assignment of the observed vibrational structure than previously reported, which includes “hot bands,” has been proposed. Comparison between simulated and available experimental spectra has been made, and the currently most reliable sets of equilibrium geometrical parameters for P2H and its anion have been derived. The photodetachment spectrum of P2D, yet to be recorded, has also been simulated.
0021-9606
124312-[11pp]
Mok, Daniel K.W.
49a4e516-0e71-4f59-a3ec-bd607b47ef33
Lee, Edmond P.F.
f47c6d5d-2d1f-4f03-a3ff-03658812d80b
Chau, Foo-tim
e15ec394-d11b-4cbe-91f3-cdac037d9d0e
Dyke, John M.
46393b45-6694-46f3-af20-d7369d26199f
Mok, Daniel K.W.
49a4e516-0e71-4f59-a3ec-bd607b47ef33
Lee, Edmond P.F.
f47c6d5d-2d1f-4f03-a3ff-03658812d80b
Chau, Foo-tim
e15ec394-d11b-4cbe-91f3-cdac037d9d0e
Dyke, John M.
46393b45-6694-46f3-af20-d7369d26199f

Mok, Daniel K.W., Lee, Edmond P.F., Chau, Foo-tim and Dyke, John M. (2011) Franck-Condon simulation, including anharmonicity, of the photodetachment spectrum of P2H-: Restricted-spin coupled-cluster single-double plus perturbative triple and unrestricted-spin coupled-cluster single-double plus perturbative triple -F12x potential energy functions of P2H and P2H? The Journal of Chemical Physics, 135 (12), 124312-[11pp]. (doi:10.1063/1.3640037).

Record type: Article

Abstract

Geometry optimization and harmonic vibrational frequency calculations have been carried out on the ?2A? state of P2H and the ?1A? state of P2H? and the ?1A' state of P2H- using the restricted-spin coupled-cluster single-double plus perturbative triple excitation [RCCSD(T)] and explicitly correlated unrestricted-spin coupled-cluster single-double plus perturbative triple excitation [UCCSD(T)-F12x] methods. For RCCSD(T) calculations, basis sets of up to the augmented correlation-consistent polarized valence quintuple-zeta (aug-cc-pV5Z) quality were employed, and contributions from extrapolation to the complete basis set limit and from core correlation of the P 2s22p6 electrons were also included. For UCCSD(T)-F12x calculations, different atomic orbital basis sets of triple-zeta quality with different associated complementary auxiliary basis sets and different geminal Slater exponents were used. When the P 2s22p6 core electrons were correlated in these F12x calculations, appropriate core-valence basis sets were employed. In addition, potential energy functions (PEFs) of the ?2A? state of P2H and the ?1A? state of P2H? were computed at different RCCSD(T) and UCCSD(T)-F12x levels, and were used in variational calculations of anharmonic vibrational wavefunctions, which were then utilized to calculate Franck-Condon factors (FCFs) between these two states, employing a method which includes allowance for anharmonicity and Duschinsky rotation. The photodetachment spectrum of P2H? was then simulated using the computed FCFs. Simulated spectra obtained using the RCCSD(T)/aug-cc-pV5Z and UCCSD(T)-F12x(x = a or b)/aug-cc-pCVTZ PEFs are compared and found to be essentially identical. Based on the computed FCFs, a more detailed assignment of the observed vibrational structure than previously reported, which includes “hot bands,” has been proposed. Comparison between simulated and available experimental spectra has been made, and the currently most reliable sets of equilibrium geometrical parameters for P2H and its anion have been derived. The photodetachment spectrum of P2D, yet to be recorded, has also been simulated.

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Published date: 28 September 2011
Organisations: Chemistry

Identifiers

Local EPrints ID: 200255
URI: http://eprints.soton.ac.uk/id/eprint/200255
ISSN: 0021-9606
PURE UUID: c0af3bf6-6811-439c-aeff-d8bb66cfc595
ORCID for John M. Dyke: ORCID iD orcid.org/0000-0002-9808-303X

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Date deposited: 24 Oct 2011 14:23
Last modified: 20 Jul 2019 01:27

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