High-resolution study of some doubly excited vibrational states of PH2D: the nu(1)+nu(2), nu(2)+nu(5), nu(2)+nu(3), and nu(2)+nu(6) bands

摘要

The absorption bands v(1) + v(2), v(2) + v(3), and v(2) + v(6) of PH2D have been recorded for the first time using a high-resolution Bruker 120 HR interferometer, and rotationally analyzed. Some transitions belonging to the very weak band v(2) + v(5) and enhanced in intensity by strong interactions with the v, + v2 band were also assigned. Sets of parameters obtained from the fit reproduce experimental line position of the bands v(1) + v(2) and v(2) + v(3) with about the experimental accuracy. The residuals of the ro-vibrational energies of the v(2) + v(6) band are about 10 times larger. Reasons for the poorer reproduction of the latter data are given. (C) 2004 Elsevier Inc. All rights reserved.