Chemical Physics Letters, Vol.334, No.4-6, 357-364, 2001
Phase shift cavity ring-down measurement of C-H (Delta v=6) vibrational overtone absorptions
Phase shift cavity ring-down absorption spectroscopy with a continuous laser is used to measure the absorption coefficients and integrated cross-sections for the Delta upsilon = 6 C-H stretching overtones of C2H4, C2H6, C3H8, n-C4H10, and n-C5H12. The absorption spectrum is obtained by measuring the magnitude of the phase shift that an intensity modulated continuous laser beam experiences upon passing through an optical cavity. Sensitive absorption detection (10(-6) cm(-1)) on gas-phase samples is demonstrated.