What question did this study set out to answer?

To measure rate constants for the vibrational deactivation of CO(v=1) in collisions with HD, D2, and He, as well as self-relaxation of D2(v=1), across a temperature range of 109 to 630 K.

August 15, 1976The Journal of Chemical Physics

Temperature-dependent relaxation of CO(v=1) by HD, D2, and He and of D2(v=1) by D2

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To measure rate constants for the vibrational deactivation of CO(v=1) in collisions with HD, D2, and He, as well as self-relaxation of D2(v=1), across a temperature range of 109 to 630 K.
Employed the laser-excited vibrational fluorescence technique across temperatures ranging from 109 to 630 K.
Measured fluorescence decay curves of excited CO in binary gas mixtures with He, HD, and D2 at varying mole fractions.
CO–He and CO–HD deactivation rates showed single-exponential decay, increasing from 0.067 and 0.27 sec⁻¹ torr⁻¹ at 109 K to 22.7 and 82.5 sec⁻¹ torr⁻¹ at 630 K, respectively.
CO–D2 mixtures exhibited double-exponential decay, with intermolecular vibrational-to-vibrational (V–V) transfer rates rising from 0.26 sec⁻¹ torr⁻¹ at 202 K to 69.4 sec⁻¹ torr⁻¹ at 633 K (ΔE = −850 cm⁻¹).
Vibrational-to-translational/rotational deactivation of CO by D2 increased from 0.089 sec⁻¹ torr⁻¹ at 156 K to 3.7 sec⁻¹ torr⁻¹ at 450 K, while D2 self-deactivation rose from 0.080 to 6.9 sec⁻¹ torr⁻¹ over the same interval.

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Implication

Spectroscopic study reveals temperature-dependent deactivation rates for vibrating carbon monoxide with helium, HD, and D2, indicating rotational motion governs energy transfer efficiency.

Cite This Study

Drozdoski et al. (1976) studied this question.

synapsesocial.com/papers/6a86bb11c026610cc182aaa3 https://doi.org/10.1063/1.433210

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Implication

Spectroscopic study reveals temperature-dependent deactivation rates for vibrating carbon monoxide with helium, HD, and D2, indicating rotational motion governs energy transfer efficiency.

Temperature-dependent relaxation of CO(v=1) by HD, D2, and He and of D2(v=1) by D2

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Discussion

Implication

Cite This Study

Temperature-dependent relaxation of CO(v=1) by HD, D2, and He and of D2(v=1) by D2

Key Points

Discussion

Implication

Cite This Study

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