Laser emission in the 83-223 µm region from PH3with laser line assignments

Optical pumping of PH
3
with a CO
2
TEA laser has yielded 44 far IR lasing lines in the
83-223 \mu
m region. A table of energy levels for the ground state ν
2
and ν
4
has been compiled which has permitted the assignment of 16 absorption matches and 40 laser lines. Four of the laser lines appear to have high gain and lase, single pass with CO
2
mode-locked pumping.