Abstract
The measurement of the degree of dissociation and a discussion of the formation of excited laser-active HCN molecules are presented. It is shown that HCN molecules formed by chemical reactions on the wall of the discharge tube contribute significantly to the laser gain and cause the experimentally observed constant gain over the resonator.
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The value ofH o(r) at the tube axis can be lower than that near the wall due to the radial gradients of the neutral temperature, of the electron temperature and of the electron concentration. Consequently, the radial dependence ofH o(r) will be described by a complex formula which is, near the tube axis, less curved than the Bessel function Jo(2.4r/R), Eq. (7), would require. For the same reasons the factor δ in (13) will increase near the tube axis which will result in a steeper decrease of ΔNw (r) than would correspond to the function\(J_0 (i\sqrt {\delta R^2 /D} r/R)\). Nevertheless, both these changes will tend to cancel each other in (15). Because of the lack of experimental data at present it would not be reasonable to try more sophisticated calculations
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Schötzau, H.J., Vepřek, S. Wall processes and radial gain of the cw HCN laser. Appl. Phys. 7, 271–277 (1975). https://doi.org/10.1007/BF00900323
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DOI: https://doi.org/10.1007/BF00900323