Measurements of rotational transitions and hyperfine structure in PH 2D

Abstract

New rotational transition frequencies and measurements of hyperfine structure on two transitions are reported for PH 2D. All observed transitions are Q branch (Δ J = 0) so only two independent rotational constants are obtained. These are A- C = 46 593.44 ± 0.67 MHz and κ( A- C) = 2 B- A- C = −34 545.9 ± 1.3 MHz. Nine transitions were fit to these parameters and the distortion parameter D JK to obtain D JK = 4.30 ± 0.04 MHz. Hyperfine structure due to spin-rotation interactions was observed on the 1 10 ← 1 11 transition at 6 024.645 MHz and on the 4 14 ← 4 04 transition at 20 815.334 MHz. Spin-rotation tensor components obtained are (M aa + M bb) 2 = (M aa + M cc) 2 = −98 ± 3 kHz .