Energy-Transfer Processes in Monochromatically Excited Iodine Molecules. V. Rotational Energy Transfer in Argon-Excited I2

Abstract

Rotationally resolved energy‐transfer rates have been measured for I₂ excited to $\text{J′=11}$ and 15 of $\text{v′ = 43}$ of the ${\mathrm{B\hspace{0.17em}}}^3{\Pi }_{0_u}^{+}$ state by the argon laser line at 5145 Å, for accompanying changes in v′ of 0, $\text{± 1}$ , $\text{± 2}$ , and $\text{± 3}$ , in collisions with ground‐state I₂, H₂, He, and Ne. In all of these collisions, there is a persistence of rotational state, $\text{|\hspace{0.17em}Δ J′\hspace{0.17em} | ≤ 14}$ being favored; however, broader distributions are found, as expected, for collisions with larger |Δ v|'s or with heavier collision partners. The microscopic rate constants are asymmetric to $\text{Δ J′>0}$ , as expected for ${\mathrm{(T/B)}}^{\text{1/2}}\text{≈ 80}$ .