Laser Stark spectroscopy of phosphine

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Abstract
A laser Stark spectrum of PH3 has been observed by using 12C16O2, 13C16O2, 12C18O2, and N2O lasers. Coincidences have been found for 44 ν2 band lines and 31 ν4 band lines for Stark fields up to 60 kV/cm. Zero-field frequencies of the ν2 and ν4 band lines and several A1A2 splittings in the ν2 and ν4 states have been determined. Effective dipole moments for rotational levels in the ν2 and ν4 states have been determined and analyzed by taking into account the mixing of the states resulting from the Coriolis interaction between the ν2 and ν4 states and by introducing the transverse dipole moment between the two states.