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Measurement of V‐V transfer rate from HF v = 3 using simultaneous optical pumping on the HF v = 2 → 1 and v = 1 → 0 bands
1.R. M. Osgood, Jr., A. Javan, and P. B. Sackett, Appl. Phys. Lett. 20, 469 (1972). Note the change in notation between this letter and that of the previous work. of this paper equals the Γ of the previous letter. as described later, is the the V‐T, R of the level.
2.A more detailed study of this diffusion process (which is fundamentally different from the usual diffusion to and quenching at the walls) is presently underway and will be discussed at length elsewhere. In brief, this process may be explained by noting that as molecules in etc., diffuse out of the region of the laser excitation, they encounter a bath of unexcited (vibrationally “cold”) HF molecules. Rapid V‐V reequilibration via V‐V collisional decay then causes these highly excited molecules to give up their quanta to molecules formerly in the state. Thus, while the total number of vibrational quanta is preserved, the total number of molecules in is still reduced. Note that the increase in the population in is insignificant since etc.
3.Recalculation of using the exact expression for the time of fluorescence peakvs gives This is roughly 20% higher than the value calculated in Ref. 1 on the basis of a more convenient approximate formula.
4.A recent measurement by J. R. Airey and I. W. M. Smith [J. Chem. Phys. 57, 1966 (1972)] uses computer analysis of chemilumineseence from an HF‐yielding reaction to calculate values for and which are a factor of 0.75 and 0.4, respectively, times the values obtained by our technique. In view of the relatively indirect nature of the technique of Airey and Smith, the agreement between the two sets of numbers seems good.
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