Vibrational Relaxation of Hydrogen

摘要

The rates of vibrational relaxation of D2and HD have been studied by laserhyphen;induced vibrational fluorescence technique. The relaxation times of D2sol;HCl, HDsol;HCl, D2sol;H2sol;HCl, and D2sol;HDsol;HCl mixtures at 296deg;K show cross sections ofVrarr; T, R energy transfer assgr;D2sngbnd;D2equals;1.4 plusmn; 0.1 times; 10minus;22thinsp;cm2,sgr;D2sngbnd;H2equals;1.4 plusmn; 0.1 times; 10minus;21thinsp;cm2,sgr;D2sngbnd;HDequals;8.2 plusmn; 1.0 times; 10minus;22thinsp;cm2,sgr;HDsngbnd;HDequals;6.9 plusmn; 0.8 times; 10minus;22thinsp;cm2,sgr;HClsngbnd;D2equals;4.0 plusmn; 0.4 times; 10minus;21thinsp;cm2,sgr;HClsngbnd;HDequals;1.7 plusmn; 0.2 times; 10minus;20thinsp;cm2.Cross section forVrarr;Venergy transfer from HCl to HD assgr;HClsngbnd;HDv rarr; vequals;2.0 plusmn; 0.2 times; 10minus;20thinsp;cm2.Comparison of vibrational relaxation rates among hydrogen isotopes and direct correlation between high temperature shock tube results and room temperature data reveal the importance of both rotational and translational motion in the process of vibrational energy transfer of hydrogen.