Line strengths of rovibrational and rotational transitions in the X2Π ground state of OH
Makaleler > Tam Makale · 2015
Yazarlar: James S. A. Brooke, Peter F. Bernath, Colin M. Western, Christopher Sneden, Melike AFŞAR, Gang Li, Iouli E. Gordon
Journal of Quantitative Spectroscopy and Radiative Transfer, SCI Expanded İndekslerine Giren Dergi, Uluslararası, Wos, 2015, cilt 168, ss 142-157
DOI: 10.1016/j.jqsrt.2015.07.021
Özet
A new line list including positions and absolute transition strengths (in the form of Einstein A values and oscillator strengths) has been produced for the OH ground X-2 Pi state rovibrational (Meinel system) and pure rotational transitions. All possible transitions are included with v' and v '' up to 13, and J up to between 9.5 and 59.5, depending on the band. An updated fit to determine molecular constants has been performed, which includes some new rotational data and a simultaneous fitting of all molecular constants. The absolute transition strengths are based on a new dipole moment function, which is a combination of two high level ab initio calculations. The calculations show good agreement with an experimental v = 1 lifetime, experimental mu(v) values, and Delta v =2 line intensity ratios from an observed spectrum. To achieve this good agreement, an alteration in the method of converting matrix elements from Hund's case (b) to (a) was made. Partitions sums have been calculated using the new energy levels, for the temperature range 5-6000 K, which extends the previously available (in HITRAN) 70-3000 K range. The resulting absolute transition strengths have been used to calculate 0 abundances in the Sun, Arcturus, and two red giants in the Galactic open and globular clusters M67 and M71. Literature data based mainly on [O I] lines are available for the Sun and Arcturus, and excellent agreement is found. (C) 2015 Elsevier Ltd. All rights reserved.