Acetylene weak bands at 2.5 μm from intracavity Cr2+:ZnSe laser absorption observed with time-resolved Fourier transform spectroscopy
Véronique Girard, Robert Farrenq, Evgeni Sorokin, Irina T. Sorokina, Guy Guelachvili, Nathalie Picqué
Abstract
The spectral dynamics of a mid-infrared multimode Cr2+:ZnSe laser located in a vacuum sealed chamber containing acetylene at low pressure is analyzed by a stepping-mode high-resolution time-resolved Fourier transform interferometer. Doppler-limited absorption spectra of C2H2 in natural isotopic abundance are recorded around 4000 cm-1 with kilometric absorption path lengths and sensitivities better than 3 10-8 cm-1. Two cold bands are newly identified and assigned to the n1+n41 and n3+n51 transitions of 12C13CH2. The n1+n51 band of 12C2HD and fourteen 12C2H2 bands are observed, among which for the first time n2+2n42+n5-1.
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