TA8 - Gain measurements on CO P-branch transitions in a C2H2-O2flame

Optical gain was detected in the CO X
¹
\Sigma+
infrared transitions
P_{9-8}(12)
and
P_{8-7}(12)
in a 4.6-cm-long free-burning C
2
H
2
-O
2
flame. At a total pressure of 11-torr gain (or loss) on the
P_{9-8}(12)
, transition was measured in the preflame, visible flame, and postflame zones of fuel-lean flames.