The lowest rotational transition of several isotopic forms of KrD

The J=0–1 absorption line of KrD+ has been observed for all six stable krypton isotopes in a dc glow discharge in Kr–D2 mixtures. For 83KrD+ the quadrupole coupling constant [eQq=549.1(5) MHz] and nuclear magnetic coupling constant [CN=−0.022(2) MHz] were determined. By combining the new microwave data for KrD+ with very precise published Dunham constants for KrH+ from Johns’ high resolution infrared spectral data, the mass independent Dunham parameters U01, ΔH01, and ΔKr01 were deduced. Precise Doppler shift measurements indicated a small drift velocity in the magnetic field enhanced, abnormal discharge in the direction opposite to that naively expected from the electrode polarity.