title: Acetylene weak bands at 2.5 μm from intracavity Cr:ZnSe laser absorption observed with time-resolved Fourier transform spectroscopy.
abstract: The spectral dynamics of a mid-infrared multimode Cr(2+):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 C(2)H(2) 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 ν(1)+ν(4) (1) and ν(3)+ν(5) (1) transitions of (12)C(13)CH(2). The ν(1)+ν(5) (1) band of (12)C(2)HD and fourteen (12)C(2)H(2) bands are observed, among which for the first time ν(2)+2ν(4) (2)+ν(5) (-1).
authors.affiliation: Laboratoire de Photophysique Moléculaire, Unité Propre du C.N.R.S., Bâtiment 350, Université de Paris-Sud, 91405 Orsay, France.
authors.forename: Véronique
authors.initials: V
authors.lastname: Girard
authors.forename: Robert
authors.initials: R
authors.lastname: Farrenq
authors.forename: Evgeni
authors.initials: E
authors.lastname: Sorokin
authors.forename: Irina T
authors.initials: IT
authors.lastname: Sorokina
authors.forename: Guy
authors.initials: G
authors.lastname: Guelachvili
authors.forename: Nathalie
authors.initials: N
authors.lastname: Picqué