Abstract
Emission from the lowest quintet state of CO is observed in low power glow discharge. Intersystem crossing from the
state to the
state makes transition from the
state to lower lying states possible. The term values for the three lower vibrational levels of the
state are found to be
,
and
above the ground level. The fundamental vibrational frequency of the
state is found to be
. Analysis of the relaxation pathways of excited CO molecules via the
state is carried out and transition lines assigned.