Very high resolution CARS spectroscopy in a molecular beam

Signal-to-noise calculations are presented for coherent anti-Stokes Raman spectroscopy (CARS) in a molecular beam. Using high peak power pulsed lasers and a high density molecular beam,
S/N
for the H
2
Q(1) line is expected to be
\sim 10^{4}
, with a Doppler width reduction from 1100 to 20 MHz.