Line mixing in the Raman Q branch in D₂ and mixtures of D₂ in He and Ar

Abstract

Weak mixing coefficients for D2 and D2–He mixtures at 305.2 and 100.7 K are reported and compared with ab initio quantal calculations. The measurements support but do not provide a critical test of the calculations. Measurements of 50% D2 in Ar at 305.2 K are at variance with the measurements in the pure gas and in mixtures with He and below 20 amagat exhibit an increasing line asymmetry with decreasing density. The results are also at variance with the asymmetries measured in 5% H2 in Ar. PACS No.: 33.70.Jg, 33.20.Fb

Testing the ab initio quantum‐scattering calculations for the D2–He benchmark system with stimulated Raman spectroscopy

“…Nevertheless, the shapes of the He‐perturbed D 2 lines are interesting for testing the D 2 –He interactions, for the determination of the D 2 quadrupole moment, its polarizabilities, the ortho:para concentration ratio at various temperatures and eventually the departures from standard line‐shape profiles. In this vein, let us mention the experimental studies and line shapes analyses of Smyth et al of Forsman et al and of May and coworkers . All these studies dealt with the 1‐0 Q branch of D 2 in He.…”

H2-He collisions:Ab initiotheory meets cavity-enhanced spectra

“…Experimental studies on the interactions between two hydrogen molecules and between a hydrogen molecule * mslowinski@umk.pl † piotr.wcislo@fizyka.umk.pl and a noble gas atom have a several-decades-long history [6,7,[12][13][14][15]. Recently, the rotationally inelastic scattering of the HD molecule colliding with D 2 [16,17] and with He [18] at 1 K was observed in coexpanded supersonic beams and theoretically handled by Croft et al [19].…”