Issue 6, 2019

A variationally computed room temperature line list for AsH3


Calculations are reported on the rotation–vibration energy levels of the arsine molecule with associated transition intensities. A potential energy surface (PES) obtained from ab initio electronic structure calculations is refined to experimental data, and the resulting energy levels display sub-wavenumber accuracy for all reliably known J = 0 term values under 6500 cm−1. After a small empirical adjustment of the band centres, our calculated (J = 1–6) rovibrational states reproduce 578 experimentally derived energies with a root-mean-square error of 0.122 cm−1. Absolute line intensities are computed using the refined PES and a new dipole moment surface (DMS) for transitions between states with energies up to 10 500 cm−1 and rotational quantum number J = 30. The computed DMS reproduces experimental line intensities to within 10% uncertainty for the ν1 and ν3 bands. Furthermore, our calculated absorption cross-sections display good agreement with the main absorption features recorded in the Pacific Northwest National Laboratory (PNNL) for the complete range of 600–6500 cm−1.

Graphical abstract: A variationally computed room temperature line list for AsH3

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Article information

Article type
17 Nov 2018
09 Jan 2019
First published
14 Jan 2019
This article is Open Access
Creative Commons BY license

Phys. Chem. Chem. Phys., 2019,21, 3264-3277

A variationally computed room temperature line list for AsH3

P. A. Coles, S. N. Yurchenko, R. P. Kovacich, J. Hobby and J. Tennyson, Phys. Chem. Chem. Phys., 2019, 21, 3264 DOI: 10.1039/C8CP07110A

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