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Hydrogen–Chlorine Explosion Laser. II. DCl

1968; American Institute of Physics; Volume: 49; Issue: 3 Linguagem: Inglês

10.1063/1.1670235

1520-9032

P. Corneil, George C. Pimentel,

Atomic and Subatomic Physics Research

Further work on the H2–Cl2 explosion laser shows that the emission occurs in υ = 2 → 1 vibration–rotation transitions P2(4) to P2(8) instead of 1 → 0 transitions, as concluded earlier. The laser emission is intensified with higher flash energy and with shorter flash duration. The effects of reactant pressures reflect the factors that influence the rate of the first reaction in the explosion chain. Raising temperature raises the laser gain, again due to acceleration of the Cl + H2 reaction, despite Doppler broadening, pressure broadening, and increased rotational dilution. With all conditions optimized, the D2–Cl2 explosion laser was successfully operated giving DCl 2 → 1 transitions P2(7) to P2(9). With HD–Cl2 mixtures, both HCl and DCl emissions were obtained. By mixing HD, H2, and D2 we were able to deduce for the first time the relative rates of the two reactions Cl + HD → lim kHHCl + D and Cl + HD → lim kDDCl + H: kH / kD = 1.9. The important processes in this chemical laser are becoming clear. A crucial datum needed for the determination of energy distribution among the vibrational levels is the rotational temperature at the time laser threshold is reached, since Tr rises during the explosion.