1 research outputs found
A New Band System of the Dicarbon Molecule in the Vacuum Ultraviolet Region
As one of the most abundant molecules in the universe,
the long
history of spectroscopic studies of the dicarbon molecule, C2, reaches back two centuries. While many electronic band systems
with upper states below the lowest dissociation threshold have been
well characterized, much less is known about transitions to higher-lying
states. Here, we report the observation of a new band system of C2 from the lowest triplet state a3Î u through a resonance-enhanced multiphoton ionization
scheme. The upper state is identified as 13Σg+, which is determined to be 61539.0 cm–1 (7.630 eV) above ground state X1Σg+. The spectroscopic parameters determined for
the 13Σg+ state are in excellent
agreement with those predicted by the high-level ab initio calculations.
This study paves the way for systematic investigations of the photoabsorption
and photodissociation of C2 in the vacuum ultraviolet region,
which has important applications in the field of astrochemistry