Anharmonic vibrational frequencies and vibrationally averaged structures and nuclear magnetic resonance parameters of FHF−
J. Chem. Phys. 128, 214305 (2008); doi:10.1063/1.2933284
Published 3 June 2008
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The anharmonic vibrational frequencies of FHF− were computed by the vibrational self-consistent-field, configuration-interaction, and second-order perturbation methods with a multiresolution composite potential energy surface generated by the electronic coupled-cluster method with various basis sets. Anharmonic vibrational averaging was performed for the bond length and nuclear magnetic resonance indirect spin-spin coupling constants, where the latter computed by the equation-of-motion coupled-cluster method. The calculations placed the vibrational frequencies at 580 (
1), 1292 (
2), 1313 (
3), 1837 (
1+
3), and 1864 cm−1 (
1+
2), the zero-point H–F bond length (r0) at 1.1539 Å, the zero-point one-bond spin-spin coupling constant [1J0(HF)] at 124 Hz, and the bond dissociation energy (D0) at 43.3 kcal/mol. They agreed excellently with the corresponding experimental values:
1=583 cm−1,
2=1286 cm−1,
3=1331 cm−1,
1+
3=1849 cm−1,
1+
2=1858 cm−1, r0=1.1522 Å, 1J0(HF)=124±3 Hz, and D0=44.4±1.6 kcal/mol. The vibrationally averaged bond lengths matched closely the experimental values of five excited vibrational states, furnishing a highly dependable basis for correct band assignments. An adiabatic separation of high- (
3) and low-frequency (
1) stretching modes was examined and found to explain semiquantitatively the appearance of a
1 progression on
3. Our calculations predicted a value of 186 Hz for experimentally inaccessible 2J0(FF).
©2008 American Institute of Physics
1), 1292 (
2), 1313 (
3), 1837 (
1+
3), and 1864 cm−1 (
1+
2), the zero-point H–F bond length (r0) at 1.1539 Å, the zero-point one-bond spin-spin coupling constant [1J0(HF)] at 124 Hz, and the bond dissociation energy (D0) at 43.3 kcal/mol. They agreed excellently with the corresponding experimental values:
1=583 cm−1,
2=1286 cm−1,
3=1331 cm−1,
1+
3=1849 cm−1,
1+
2=1858 cm−1, r0=1.1522 Å, 1J0(HF)=124±3 Hz, and D0=44.4±1.6 kcal/mol. The vibrationally averaged bond lengths matched closely the experimental values of five excited vibrational states, furnishing a highly dependable basis for correct band assignments. An adiabatic separation of high- (
3) and low-frequency (
1) stretching modes was examined and found to explain semiquantitatively the appearance of a
1 progression on
3. Our calculations predicted a value of 186 Hz for experimentally inaccessible 2J0(FF).
©2008 American Institute of Physics
| History: | Received 29 February 2008; accepted 30 April 2008; published 3 June 2008 |
| Permalink: |
http://link.aip.org/link/?JCPSA6/128/214305/1 |
KEYWORDS and PACS
bond lengths,
configuration interactions,
coupled cluster calculations,
dissociation energies,
excited states,
ionisation potential,
potential energy surfaces,
SCF calculations,
vibrational states
- 33.15.Mt
Molecular rotation, vibration, and vibration-rotation constants - 31.15.xr
Self-consistent-field methods in atomic and molecular physics - 31.15.bw
Coupled-cluster theory - 31.15.vn
Electron correlation calculations for diatomic molecules - 31.50.Df
Potential energy surfaces for excited electronic states (atoms and molecules) - 33.15.Fm
Molecular bond strengths, dissociation energies - YEAR: 2008
RELATED DATABASES
PUBLICATION DATA
0021-9606 (print)
1089-7690 (online)
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