Absorption spectrum of neutral phosphorus (P I) in the range 7700-8256 Å

The absorption spectrum of neutral phosphorus was recorded in the range 7700-8256 using optical heterodyne magnetic rotation concentration modulation spectroscopy with a tunable Ti:sapphire laser as the light source. Phosphorus atoms were excited by discharging the mixed gases of phosphorus vapor and neon gas. The phosphorus vapor was prepared by heating white phosphorus chips placed on a cylindrical copper electrode during discharge. In total, 234 lines of P I were observed, of which 127 were assigned. The transition frequencies were obtained with an uncertainty of 0.007 cm^-1. Empirical line intensities were provided covering four orders of magnitude.