Self broadening in the v1 band of NH 3

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Self-broadening coefficients, pressure shifts and integrated intensities have been measured for Q- and R-branch transitions in the v 1 fundamental band of ammonia using a difference-frequency laser spectrometer. A strong, systematic J and K dependence of the broadening coefficients, reminiscent of the ground-state inversion transitions, is observed and compared with semiclassical line broadening calculations. Dicke narrowing is evident at intermediate pressures for the sharpest lines, primarily the R( J, 0) transitions. Incipient line mixing is apparent in the Q branch at pressures above ∼0.1 bar.