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/Nfor the H2Q(1) line is expected to besim 10^{4}, with a Doppler width reduction from 1100 to 20 MHz.