The Vibration-Rotation Bands of the Hydrogen Halides HF, H35Cl, H37Cl, H79Br, H81Br and H127I

Naudé, S. M.; Verleger, H.

doi:10.1088/0370-1298/63/5/305

Cited by 33 publications

(11 citation statements)

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“…The line widths correspond to lifetimes of 5.3 and 7.6 ps, respectively. The gas-phase rotational constants in the vibrationally excited state are B 1 = 10.1445 cm -1 and B 1 = 10.1213 cm -1 for H 35 Cl and H 37 Cl, respectively . Obviously, the 0.2% difference in the rotational energies cannot account for the observed 42% difference in the lifetimes.…”

Section: Discussionmentioning

confidence: 91%

“…The gas-phase rotational constants in the vibrationally excited state are B 1 ) 10.1445 cm -1 and B 1 ) 10.1213 cm -1 for H 35 Cl and H 37 Cl, respectively. 58 Obviously, the 0.2% difference in the rotational energies cannot account for the observed 42% difference in the lifetimes. So far, we have no explanation for this experimental observation.…”

Section: Discussionmentioning

confidence: 97%

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Observation of Rovibrational Transitions of HCl, (HCl)₂, and H₂O−HCl in Liquid Helium Nanodroplets

et al. 2007

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We report the infrared spectra of HCl, (HCl)2, and H2O-HCl in liquid helium nanodroplets in the frequency region between 2680 and 2915 cm(-1). For the HCl monomer a line width of 1.0 cm(-1) (H35Cl) corresponding to a lifetime of 5.3 ps was observed. The line broadening indicates fast rotational relaxation similar to that previously observed for HF. For (HCl)2 the free HCl as well as the bound HCl stretching band has been observed. The nu2+ bands of (HCl)2 could be rotationally resolved, and rotational constants were deduced from the spectra. We observed both the allowed and the symmetry forbidden transition. However, the forbidden "broken symmetry" tunneling transition of the mixed dimer shows an intensity that is considerably enhanced compared to the gas phase. Upon the basis of the present measurements we were able to calculate the tunneling splitting in the excited state. The tunneling splitting is found to be reduced by 28% compared to the gas phase. Transitions from the ground state to the Ka=1 level of the free HCl stretch (nu1) are recorded and show considerable line broadening with a line width of 2 cm(-1). The excited state Ka=1 has an additional rotational energy of about 10 cm(-1), thereby allowing fast rotational relaxation by coupling to helium excitations. In addition we observed the HCl stretch of the HCl-H2O dimer, which exhibits an unusually large width (1.7 cm(-1) for H35Cl)) and large red shift (8.5 cm(-1)), compared to the gas-phase values. The large-amplitude motion originating from the libration mode of the HCl-H2O complex is supposed to act as a fast relaxation manifold.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 97%

Observation of Rovibrational Transitions of HCl, (HCl)₂, and H₂O−HCl in Liquid Helium Nanodroplets

et al. 2007

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“…After their work, however, improved spectroscopic techniques in the infrared region provided new data as well as those of improved precision. In most of earlier measurements of vibration-rotation transitions of HBr, low-resolution spectra were observed with grating spectrometers in the near-infrared and the mid-infrared region [2][3][4][5][6]. In later measurements, highresolution spectroscopy was performed: laser spectroscopy on overtone bands in the near-infrared region [7] and Fourier transform (FT) spectroscopy on the fundamental and hot bands in the mid-infrared region [8].…”

Section: Introductionmentioning

confidence: 99%

Isotopically invariant analysis of vibration–rotation transitions of HBr and its isotopologues

Odashima¹

2006

Journal of Molecular Spectroscopy

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“…Br 2 is industrially obtained by oxidation of bromide (Br À ) ions.T he oxidation process can be carried out with oxocompounds, [3] electrochemical methods, [4] catalytic methods, [5] or various oxidizing species. [6] However,t he two most widespread Br 2 extraction processes are steaming out-and air blowing-processes.Both technologies use gaseous chlorine as the oxidizing agent, according to Equation 1.…”

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confidence: 99%

Elemental Bromine Production by TiO₂ Photocatalysis and/or Ozonation

et al. 2016

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Significant production of elemental bromine (Br 2 ) was observed for the first time when treating bromide containing solutions at acidic pH, with TiO 2 photocatalyst, ozone,o racombination thereof.B r 2 selectivities up to approximately 85 %w ere obtained and the corresponding bromine mass balance values satisfied. The process is general and may be applied at alaboratory scale for green bromination reactions,orindustrially as acheap,safe,and environmentally sustainable alternative to the currently applied bromine production methods.

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The Vibration-Rotation Bands of the Hydrogen Halides HF, H³⁵Cl, H³⁷Cl, H⁷⁹Br, H⁸¹Br and H¹²⁷I

Cited by 33 publications

References 10 publications

Observation of Rovibrational Transitions of HCl, (HCl)₂, and H₂O−HCl in Liquid Helium Nanodroplets

Observation of Rovibrational Transitions of HCl, (HCl)₂, and H₂O−HCl in Liquid Helium Nanodroplets

Isotopically invariant analysis of vibration–rotation transitions of HBr and its isotopologues

Elemental Bromine Production by TiO₂ Photocatalysis and/or Ozonation

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The Vibration-Rotation Bands of the Hydrogen Halides HF, H35Cl, H37Cl, H79Br, H81Br and H127I

Cited by 33 publications

References 10 publications

Observation of Rovibrational Transitions of HCl, (HCl)2, and H2O−HCl in Liquid Helium Nanodroplets

Observation of Rovibrational Transitions of HCl, (HCl)2, and H2O−HCl in Liquid Helium Nanodroplets

Isotopically invariant analysis of vibration–rotation transitions of HBr and its isotopologues

Elemental Bromine Production by TiO2 Photocatalysis and/or Ozonation

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The Vibration-Rotation Bands of the Hydrogen Halides HF, H³⁵Cl, H³⁷Cl, H⁷⁹Br, H⁸¹Br and H¹²⁷I

Observation of Rovibrational Transitions of HCl, (HCl)₂, and H₂O−HCl in Liquid Helium Nanodroplets

Observation of Rovibrational Transitions of HCl, (HCl)₂, and H₂O−HCl in Liquid Helium Nanodroplets

Elemental Bromine Production by TiO₂ Photocatalysis and/or Ozonation