Rotational and vibrational energy transfer in vibrationally excited acetylene at energies near 6560 cm−1

Abstract

Collisional energy transfer kinetics of vibrationally excited acetylene has been examined for states with internal energies near 6560 cm(-1). Total population removal rate constants were determined for selected rotational levels of the (1,0,1,0(0),0(0)) and (0,1,1,2(0),0(0)) states. Values in the range of (10-18) × 10(-10) cm(3) s(-1) were obtained. Measurements of state-to-state rotational energy transfer rate constants were also carried out for these states. The rotational energy transfer kinetics was found to be consistent with simple energy gap models for the transfer probabilities. Vibrational transfer out of the (0,1,1,2(0),0(0)) state accounted for no more than 16% of the total removal process. Transfer from (1,0,1,0(0),0(0)) to the u-symmetry (0,2,0,3(1),1(-1)), (0,1,1,2(0),0(0)), and (1,1,0,1(1),1(-1)) states was observed. Applying the principle of detailed balance to these data indicated that vibrational transfer to (1,0,1,0(0),0(0)) accounted for ~0.1% of the population loss from (0,2,0,3(1),1(-1)) or (0,1,1,2(0),0(0)), and 3% of the loss from (1,1,0,1(1),1(-1)). Relative rotational transfer probabilities were obtained for transfer to the g-symmetry (1,1,0,2(0),0(0))∕(0,0,2,0(0),0(0)) dyad. These results are related to recent studies of optically pumped acetylene lasers.

Action spectroscopy of SrCl+ using an integrated ion trap time-of-flight mass spectrometer

“…Second, the Coulomb repulsion between ions typically limits available densities 26 to ∼ 10 8 cm −3 . Further, though a systematic review of the available spectroscopic data for small molecular ions was carried out by Berkowitz and Groeneveld 27 in 1983 in an effort to encourage the community, in recent years the majority of a) Electronic mail: teek24@ucla.edu interest -with notable exceptions [28][29][30][31][32][33][34] -has shifted toward large molecular ions 35 , atomic and molecular clusters 36 , and multiply charged ions 37 . Therefore, for the burgeoning field of ultracold molecular-ion research to realize its full potential, new efforts in small molecular ion spectroscopy are required.…”