Infrared radiative decay constants for the vibrational levels of CO  (a 3Π)

Abstract

Articles you may be interested inMeasured radiative lifetimes of rovibronic levels in the A1Π(v=0) state of CO and comparison with theory AIP Conf.Radiative decay rates from deperturbed v=0-7 vibrational levels of CO A 1Π measured using synchrotron radiation Th decay of the CO( a 3I1, v' = 0-3) levels have been studied in a flowing-afterglow apparatus. The e 3 X 1,<,+) . . . t 't Th results vibrational distribution was monitored by observing the CO(a I1-""'. emtSS10n In ensl y. e , were interpreted to obtain 52.5, 77, and 178 sec-1 for the infrared radiative dec~y.constants for the v = I, 2, and 3 vibrational levels of CO( a 3I1). The data also establish that the upper limtt to t~e rate cons~t for vibrational relaxation ofCO(a) by collision with He is :<;;6XIO-17 cm 3 moiecule-1 sec-, corresponding to a collision probability of :<;; 1.5 X 10-7 .

Submillimeter-Wave Spectroscopy of CO in the a3Π State

“…In spite of the long radiative lifetime of 7.5 ms (1), the spin forbidden transition to the ground state, a 3 ⌸-X 1 ⌺ ϩ , has been extensively studied by Field et al (2). The electronic configuration of CO in the a 3 ⌸ state is (2p) 4 (2p) 1 (2p*) 1 , isoconfigurational with the A 1 ⌸ state that lies 2 eV higher in energy. The next higher configuration, (2p) 3 3 ⌸ state have been well studied (3) and summarized in the review of Tilford and Simmons (4).…”

Vibrational relaxation of CO+(A2.PI.i), CS(A1.PI.), and C2(A3.PI.g) in helium

“…However, no relaxation could be observed for C2(A3IIg) or for CO(a3fI); the latter has been reported separately. 15 We also found that electronic quenching of CSÍA1!!) may occur in He.…”

“…The relaxation of CO(a3n) is very slow and resembles ground state molecules of a comparable vibrational frequency. 15 The CS(a3II) data42 are only qualitative but P10 is in the 1(T4-10"5 range. In contrast both CS(A) and CO+(A) relax readily and P10 ~0.004-0.01; only an upper limit can be set for C2(a3II) and P32 < 0.005.…”

Dipole moment functions for a 3II and A 1II carbon monoxide

“…This in turn may lead to a revised dipole moment function. On the other hand, recent measurements [9] of the radiative decay rates of a-state vibrational levels have been interpreted as supporting the experimental dipole moment function. We present our computational results now in order to facilitate the comparison between theory and new experimental results which may be forthcoming.…”