Comparison of CRDS to ICL-PAS and phase-shift CRDS spectroscopies for the absolute intensities of C–H (Δ vCH=6) overtone absorptions

• Published in: Chemical physics letters Vol. 366; no. 3; pp. 383 - 389
• Main Authors: DeMille, S, deLaat, R.H, Tanner, R.M, Brooks, R.L, Westwood, N.P.C
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.12.2002; Elsevier Science
• Subjects: Atomic and molecular physics; Biological and medical applications; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Laser spectroscopy; Molecular properties and interactions with photons; Molecular spectra; Optics; Physics; Visible spectra; Vibrational transition; Butane; Visible spectra; Laser spectroscopy; Hydrocarbons; Absorption spectra; Experimental study; Pentane; Propane; Organic compounds
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/S0009-2614(02)01616-0

Cavity ring-down spectroscopy (CRDS) has been used to obtain the visible overtone spectra (Δ v CH=6) of neo-pentane, C(CH 3) 4, propane, C 3H 8, and n-butane, C 4H 10, yielding absolute f-values for the transitions to better than 3%. For the neo-pentane overtone intensity, comparison with a recent measurement using intra-cavity laser photoacoustic spectroscopy (ICL-PAS) provides favourable agreement, with improved precision. Being absolute this value may be used as a standard for relative intensity measurements obtained by ICL-PAS. The measured propane and n-butane overtone intensities, when compared to recent work using phase-shift CRDS, indicate a lack of agreement to quoted uncertainties.