Collisional x- and A-State Kinetics of CN Using Transient Sub-Doppler Hole Burning

Details Collisional x- and A-State Kinetics of CN Using Transient Sub-Doppler Hole Burning Collisional x- and A-State Kinetics of CN Using Transient Sub-Doppler Hole Burning

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confera02h&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Physics

Dynamics

Scientific paper

We examine the collisional kinetics of the CN radical using transient hole-burning and saturation recovery. Narrow velocity groups of individual hyperfine levels in CN are depleted (X2Σ^+) and excited (A2Π) with a saturation laser, and probed by a counterpropagating, frequency modulated probe beam. Recovery of the unsaturated absorption is recorded following abrupt termination of an electro optically switched pulse of saturation light. Pressure-dependent recovery kinetics are measured for precursors, ethane dinitrile, NCCN, and pyruvonitrile, CH_3COCN, and buffer gases, helium, argon and nitrogen with rate coefficients ranging from 0.7-2.0 x 10-9 cm3 s-1 molec-1. In the case of NCCN, recovery kinetics are for two-level saturation resonances, where the signal observed is a combination of X- and A-state kinetics. Similar rates occur for three-level crossover resonances, which can be chosen to probe selectively the hole-filling in the X state or the decay of velocity-selected A state radicals. However in the case of CH_3COCN, which has a dipole moment of 3.45 D, the X-state kinetics are faster than the A-state due to an efficient dipole-dipole rotational energy transfer mechanism as the X-state dipole moment is 1.5 D and the A-state dipole moment is 0.06 D. The observed recovery rates are 2-3 times faster than the estimated rotationally inelastic contribution and are a combination of inelastic and velocity-changing elastic collisions.
Acknowledgment: This work was carried out under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.

Affiliated with

Also associated with

No associations

Rating

Collisional x- and A-State Kinetics of CN Using Transient Sub-Doppler Hole Burning does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Collisional x- and A-State Kinetics of CN Using Transient Sub-Doppler Hole Burning, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Collisional x- and A-State Kinetics of CN Using Transient Sub-Doppler Hole Burning will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1591482