The J = 2 ← 1 transitions of the previously unobserved isotopologues 41K79Br and 41K81Br have been recorded with a pulsed-nozzle Fourier transform microwave spectrometer, newly combined with a 532 nm laser ablation source. Aspects of the experimental design are described. Rotational and nuclear quadrupole coupling constants are obtained and combined with published results for 39K79Br and 39K81Br to produce a set of isotopically invariant parameters. New rotational transitions of 23Na35,37Cl, 39K79Br, and 39K127I have also been recorded. Excited vibrational states are not observed, indicating efficient cooling of the metal halides following the initial ablation event.
Bibliographical noteFunding Information:
This work was supported by the National Science Foundation , Grant # CHE 0845290 . We are grateful to Professor Xiaoyang Zhu for initial loan of a frequency doubled Nd:YAG laser, to Professor Michael Morse for his generous advice on laser ablation, and to Carl Johnson and Chris Cook of the Physics and Astronomy Machine Shop at the University of Minnesota for invaluable help in designing and constructing the apparatus.
- Alkali halide
- Laser ablation
- Mass invariant Dunham parameters
- Microwave spectrum
- Potassium bromide