Vibrational Relaxation of Hydrogen

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Abstract
The laser schlieren technique has been applied to a shock‐tube study of hydrogen vibrational relaxation. Mixtures of 30%, 50%, and 70% normal hydrogen in argon have been investigated in the range 1100°—2700°K. The results yield an expression for relaxation in pure hydrogen, PτH2–H2 = (3.9±0.8) × 10−10 exp[(100.0±2.6) / T⅓] atm·sec (1100°—2700°K), and allow an approximate determination of the relaxation time for hydrogen dilute in argon, PτH2–Ar = 4.1 PτH2–H2 (1500°—2700°K). These results are in adequate agreement with previous data and the theoretical calculations of Salkoff and Bauer. However, they are in serious disagreement with both the correlation of Millikan and White and the SSH theory.