Spectroscopy of atoms and molecules in liquid helium
Article Abstract:
Atoms and molecules are easily picked up by large liquid helium droplets; spectra are detected through use of either laser-induced fluorescence or beam depletion following absorption. Sensitivity is high. A variety of molecules ranging from a few atoms to large organic molecules have been embedded in He droplets and studied in the infrared region or the visible region. A new interdisciplinary branch of spectroscopic research has been born, with applications to molecular physics and low-temperature physics. Helium is the only known substance to remain liquid at normal pressures down to 0 K.
Publication Name: Annual Review of Physical Chemistry
Subject: Chemistry
ISSN: 0066-426X
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Two-photon-induced fluorescence
Article Abstract:
Two-photon-induced fluorescence, the nonresonant two-photon electronic spectroscopy of polyatomic molecules, is proving useful. Three-photon studies have been carried out and two-photon-induced fluorescence anisotropy is being used for biological molecules. Pseudoparity rules provide a framework within which are found patterns in the excitation spectra of aromatic hydrocarbons and effects of substitution and vibrations. Quantum chemical predictions can be made about vibronic coupling and substituent effects on two-photon absorptivity and tensor properties of lone molecules.
Publication Name: Annual Review of Physical Chemistry
Subject: Chemistry
ISSN: 0066-426X
Year: 1997
User Contributions:
Comment about this article or add new information about this topic:
HCP-CPH isomerization: caught in the act
Article Abstract:
This article discusses energetic forces involved in the interconversion of polyatomic molecules from one mode to another. The vibrational spectrum of phosphaethyne is explained in the context of its potential energy surface, Schrodinger's equation, and the resonance Hamiltonian model.
Publication Name: Annual Review of Physical Chemistry
Subject: Chemistry
ISSN: 0066-426X
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Scanning tunneling microscopy manipulation of complex organic molecules on solid surfaces. Biomimetic nanoscale reactors and networks
- Abstracts: Dimethyl sulfide and dimethyl sulfoxide and their oxidation in the atmosphere. Conducting metal dithiolene complexes: structural and electronic properties
- Abstracts: Face selection in addition and elimination in sterically unbiased systems. Asymmetric hydroformylation
- Abstracts: Stark spectroscopy: applications in chemistry, biology, and materials science. Spectroscopy of metal ion complexes: gas-phase models for solvation
- Abstracts: Stark spectroscopy: applications in chemistry, biology, and materials science. part 2 Structural information from methyl internal rotation spectroscopy