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Title: High-Resolution Spectroscopy of NO in Helium Droplets: A Prototype for Open Shell Molecular Interactions in a Quantum Solvent

Abstract

We have measured the high-resolution infrared spectrum of the radical NO in the {sup 2}{pi}{sub 1/2} state in superfluid helium nanodroplets. The features are attributed to the {lambda}-doubling splitting and the hyperfine structure. The hyperfine interaction is found to be unaffected by the He solvation. For the {lambda}-doubling splitting, we find a considerable increase by 55% compared to the gas phase. This is explained by a confinement of the electronically excited NO states by the surrounding He. The rotational level spacing is decreased to 76% of the gas phase value. The IR transition to the J=1.5 state is found to be homogeneously broadened. We attribute both observations to the coupling between the molecular rotation and phonon/roton excitations in superfluid {sup 4}He droplets.

Authors:
; ; ;  [1];  [2]
  1. Lehrstuhl fuer Physikalische Chemie II, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, 44780 Bochum (Germany)
  2. Lehrstuhl fuer Theoretische Chemie, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, 44780 Bochum (Germany)
Publication Date:
OSTI Identifier:
20699585
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 95; Journal Issue: 21; Other Information: DOI: 10.1103/PhysRevLett.95.215301; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CONFINEMENT; DROPLETS; EXCITATION; HELIUM 4; HYPERFINE STRUCTURE; INFRARED SPECTRA; NITRIC OXIDE; PHONONS; RADICALS; ROTATIONAL STATES; SOLVATION; SOLVENTS; SPECTROSCOPY; SUPERFLUIDITY

Citation Formats

Haeften, K. von, Metzelthin, A., Rudolph, S., Havenith, M., and Staemmler, V. High-Resolution Spectroscopy of NO in Helium Droplets: A Prototype for Open Shell Molecular Interactions in a Quantum Solvent. United States: N. p., 2005. Web. doi:10.1103/PhysRevLett.95.215301.
Haeften, K. von, Metzelthin, A., Rudolph, S., Havenith, M., & Staemmler, V. High-Resolution Spectroscopy of NO in Helium Droplets: A Prototype for Open Shell Molecular Interactions in a Quantum Solvent. United States. doi:10.1103/PhysRevLett.95.215301.
Haeften, K. von, Metzelthin, A., Rudolph, S., Havenith, M., and Staemmler, V. Fri . "High-Resolution Spectroscopy of NO in Helium Droplets: A Prototype for Open Shell Molecular Interactions in a Quantum Solvent". United States. doi:10.1103/PhysRevLett.95.215301.
@article{osti_20699585,
title = {High-Resolution Spectroscopy of NO in Helium Droplets: A Prototype for Open Shell Molecular Interactions in a Quantum Solvent},
author = {Haeften, K. von and Metzelthin, A. and Rudolph, S. and Havenith, M. and Staemmler, V.},
abstractNote = {We have measured the high-resolution infrared spectrum of the radical NO in the {sup 2}{pi}{sub 1/2} state in superfluid helium nanodroplets. The features are attributed to the {lambda}-doubling splitting and the hyperfine structure. The hyperfine interaction is found to be unaffected by the He solvation. For the {lambda}-doubling splitting, we find a considerable increase by 55% compared to the gas phase. This is explained by a confinement of the electronically excited NO states by the surrounding He. The rotational level spacing is decreased to 76% of the gas phase value. The IR transition to the J=1.5 state is found to be homogeneously broadened. We attribute both observations to the coupling between the molecular rotation and phonon/roton excitations in superfluid {sup 4}He droplets.},
doi = {10.1103/PhysRevLett.95.215301},
journal = {Physical Review Letters},
number = 21,
volume = 95,
place = {United States},
year = {Fri Nov 18 00:00:00 EST 2005},
month = {Fri Nov 18 00:00:00 EST 2005}
}