Mid-infrared spectroscopy of molecular ions in helium nanodroplets

Zhang, Xiaohang; Brauer, Nils B.; Berden, Giel; Rijs, Anouk M.; Drabbels, Marcel

doi:doi:10.1063/1.3678011

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Vibrational energy relaxation of benzene dimer and trimer in the CH stretching region studied by picosecond time-resolved IR-UV pump-probe spectroscopy

Vibrational energy relaxation (VER) of the Fermi polyads in the CH stretching vibration of the benzene dimer (Bz2) and trimer (Bz3) has been investigated by picosecond (ps) time-resolved IR-UV pump-probe spectroscopy in a supersonic beam. The vibrational bands in the 3000–3100 cm−1 region were excited by a ps IR pulse and the time evolutions at the pumped and redistributed (bath) levels were probed by resonance enhanced multiphoton ionization with a ps UV pulse. For Bz2, a site-selective excitat...

Microwave, infrared and Raman spectra, r₀ structural parameters, ab initio calculations and vibrational assignment of 1-fluoro-1-silacyclopentane

The microwave spectrum (6500–18 500 MHz) of 1-fluoro-1-silacyclopentane, c-C4H8SiHF has been recorded and 87 transitions for the 28Si, 29Si, 30Si, and 13C isotopomers have been assigned for a single conformer. Infrared spectra (3050-350 cm−1) of the gas and solid and Raman spectrum (3100-40 cm−1) of the liquid have also been recorded. The vibrational data indicate the presence of a single conformer with no symmetry which is consistent with the twist form. Ab initio calculations with a variety of...

High resolution IR spectra of aniline, styrene, and 1,1-diphenylethylene cations embedded in superfluid helium nanodroplets have been recorded in the 300–1700 cm⁻¹ range using a free-electron laser as radiation source. Comparison of the spectra with available gas phase data reveals that the helium environment induces no significant matrix shift nor leads to an observable line broadening of the resonances. In addition, the IR spectra have provided new and improved vibrational transition frequencies for the cations investigated, as well as for neutral aniline and styrene. Indications have been found that the ions desolvate from the droplets after excitation by a non-evaporative process in which they are ejected from the helium droplets. The kinetic energy of the ejected ions is found to be ion specific and to depend only weakly on the excitation energy.

Article Outline

INTRODUCTION
EXPERIMENTAL SETUP
RESULTS AND DISCUSSION
1. Spectroscopy
  1. Aniline
  2. Aniline dimer
  3. Styrene
  4. 1,1-Diphenylethylene
2. Desolvation mechanism
CONCLUSION

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KEYWORDS and PACS

Keywords

atomic clusters, drops, free electron lasers, infrared spectra, liquid helium, negative ions, organic compounds, vibrational states

PACS

36.40.Mr

Spectroscopy and geometrical structure of clusters
33.15.Mt

Rotation, vibration, and vibration-rotation constants
33.20.Ea

Infrared spectra
33.20.Tp

Vibrational analysis

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3678011

PUBLICATION DATA

ISSN

0021-9606 (print)

1089-7690 (online)

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American Institute of Physics

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