Slit jet diode laser and FTIR spectroscopy of CF3I and improved analysis of the symmetric CF3 stretching chromophore absorption

Hollenstein, H.; Qüack, Martin; Richard, E. C.

doi:10.1016/0009-2614(94)00255-x

Cited by 29 publications

(9 citation statements)

References 42 publications

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“…1͑a͒, the matrix-isolation spectrum of monomeric CF 3 I shows three peaks in the symmetric C-F stretching ͑ 1 ͒ region, and they were assigned to the 2 + 3 , 1 , and 2 5 ͑l =0͒ band, by comparison with the gas phase spectra. 1, 9,10 Table II summarizes the observed line positions and their assignments in the present study and those reported previously. The 1 and the 2 5 ͑l =0͒ state are strongly coupled by Fermi resonance, and the observed band centers are perturbed ones.…”

Section: The 1 Band Regionmentioning

confidence: 77%

Infrared spectra of the CF3I dimer: A concurrent application of matrix-isolation spectroscopy and cavity ring-down spectroscopy

Ito

Hirabayashi

2006

The Journal of Chemical Physics

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We have observed infrared spectra of the CF(3)I dimer produced in a supersonic jet by matrix-isolation Fourier transform infrared spectroscopy and infrared cavity ring-down (IR-CRD) spectroscopy. In the matrix-isolation experiments, the dimer was isolated in an Ar matrix by the pulse-deposition method. The recorded spectral range covers the symmetric (nu(1)) and doubly degenerate (nu(4)) C-F stretching regions. From the concentration dependence of the matrix-isolation spectra we have assigned one dimer band for each fundamental region. It was not easy to identify the dimer band for the nu(4) band because of the multiplet feature of the monomeric nu(4) band caused by the site symmetry breaking. The spectra of (CF(3)I)(2) in the nu(4) band region were thus also measured in the gas phase by IR-CRD spectroscopy, where we detected two dimer bands. Comparing the observed band positions with the results of quantum chemical calculations, we have assigned the observed dimer bands to the head-to-head isomer. The structure of (CF(3)I)(2) and its photochemical implications are discussed, in comparison with methyl iodide dimer reported previously [Ito et al., Chem. Phys. Lett. 343, 185 (2001)].

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Section: The 1 Band Regionmentioning

confidence: 77%

Infrared spectra of the CF3I dimer: A concurrent application of matrix-isolation spectroscopy and cavity ring-down spectroscopy

Ito

Hirabayashi

2006

The Journal of Chemical Physics

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“…Supersonic jet infrared spectroscopy has been shown to be a powerful tool to simplify complex spectra of small molecules and has been applied successfully to several freons. [30][31][32][33] We recorded jet spectra of CCl 3 F in natural abundance ͑ 12 C 35 Cl 3 F, 43.1%, 12 C 35 Cl 2 37 ClF, 41.3%, 12 C 35 Cl 37 Cl 2 F, 13.2%, and 12 C 37 Cl 3 F, 1.4%, 13 CCl 3 FϷ1%, all Cl isotopomers͒ but the strong presence of the asymmetric top species rendered the spectra still too complex for a complete analysis of the FTIR spectra alone. 23…”

Section: Resultsmentioning

confidence: 97%

“…30 A mixture of 5% of natural CCl 3 F in helium was expanded through the 3.5 cmϫ60 m slit, at a pulse duration of 1.5 ms. He was preferred over Ar because of less clustering.…”

Section: Cl͒ ͑4͒mentioning

confidence: 99%

Rotational analysis of the ν1 band of trichlorofluoromethane from high resolution Fourier transform and diode laser spectra of supersonic jets and isotopically enriched samples

Snels

Beil

Hollenstein

et al. 1995

The Journal of Chemical Physics

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“…The Zürich group, therefore, in the 1980s developed high-resolution FTIR spectroscopy of supersonic jets under conditions that often satisfy the requirement of Doppler-limited resolution (instrumental bandwidth 0.0024 cm −1 or 72 MHz, unapodized) (Dübal et al 1984, Amrein et al 1987a,b,c, 1988a,b, 1989, Quack 1990. At the same time, it was recognized that an ideal combination would be to realize the advantages of high-resolution FTIR spectroscopy and diode laser spectroscopy in the same laboratory and such a combination was realized in the Zürich laboratory, leading among other things to the first analyses of the very complex infrared spectra of the important atmospheric window bands of the chlorofluoro(hydro)carbons CHFCl 2 (Snels and Quack 1991), CF 2 Cl 2 , and CFCl 3 (Snels et al 1995(Snels et al , 2001 and the complex spectra of CF 3 I (Hollenstein et al 1994; see also the work on CHClF 2 (Albert et al 2010, 2004, Amrein et al 1988a. It also led to the very first successful high-resolution rovibrational analyses of chiral molecules in the mid-1990s (Beil et al 1994, Bauder et al 1997, this work having significance well beyond ordinary rovibrational spectroscopy (Quack 2002.…”

Section: Introduction 1brief Historymentioning

confidence: 99%

High‐ResolutionFTIRand Diode Laser Spectroscopy of Supersonic Jets

Snels

Horká‐Zelenková

Hollenstein

et al. 2011

Handbook of High‐resolution Spectroscopy

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Fourier transform infrared (FTIR) spectrometers and tunable diode lasers in combination with a supersonic molecular beam expansion are a perfect tool for the investigation of molecules, ions, and radicals at low temperatures. The internal degrees of freedom of the molecules are adiabatically cooled to very low temperatures and thus only low-lying energy levels are populated. The reduction of the number of populated levels at low temperatures makes the assignment of the spectra much easier as compared to the congested room-temperature spectra. Under certain conditions, the Doppler linewidths are greatly reduced, corresponding to very low effective translational temperatures. Supersonic expansion also provides a suitable method for producing and investigating van der Waals clusters and hydrogen-bonded complexes. Unstable species such as radicals and ions can be efficiently produced and studied in a molecular beam. The low rotational temperature allows for the study of nuclear spin symmetry conservation or conversion between nuclear spin isomers. A molecular beam expansion can be obtained by expanding gas through a slit or a circular nozzle. Both expansion geometries can be used in combination with a multipass optical setup and with cavity ring down spectroscopy, which enhances the effective absorption path length. Cooling of the molecules can be promoted by seeding in noble gases. This article summarizes the general aspects of the experimental technique as well as current developments. To demonstrate how powerful the combination of a molecular beam expansion with tunable diode laser and FTIR spectroscopy can be, we report results on some important current examples.

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Slit jet diode laser and FTIR spectroscopy of CF3I and improved analysis of the symmetric CF3 stretching chromophore absorption

Cited by 29 publications

References 42 publications

Infrared spectra of the CF3I dimer: A concurrent application of matrix-isolation spectroscopy and cavity ring-down spectroscopy

Infrared spectra of the CF3I dimer: A concurrent application of matrix-isolation spectroscopy and cavity ring-down spectroscopy

Rotational analysis of the ν1 band of trichlorofluoromethane from high resolution Fourier transform and diode laser spectra of supersonic jets and isotopically enriched samples

High‐ResolutionFTIRand Diode Laser Spectroscopy of Supersonic Jets

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