Results 261 to 270 of about 206,941 (297)

Laser Spectroscopy of Cold Gas-Phase Molecules

Annual Review of Physical Chemistry, 1980
This review describes the use of supersonic molecular beams or super­ sonic free jets to prepare gas phase samples for spectroscopic study under conditions where the internal degrees of freedom, the molecular vibration and rotations, have been cooled to very low temperatures.
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Photoassociative Spectroscopy and Formation of Cold Molecules in Cold Cesium Vapor: Trap–Loss Spectrum versus Ion Spectrum

Journal of Molecular Spectroscopy, 1999
We report on the experimental spectra of all the optically accessible long-range attractive molecular states of the Cs2 dimer below the 6s2S1/2 + 6p2P3/2 dissociation limit by molecular photoassociation of cold Cs atoms. The spectra are obtained by the usual trap-loss method as well as by pulsed-laser photoionization of Cs2 molecules into Cs+2 ions ...
, Comparat, , Drag, , Fioretti, , Dulieu, , Pillet   +4 more
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Cool mid-IR Absorption Spectroscopy of cold Molecules

Optical Sensors and Sensing Congress 2022 (AIS, LACSEA, Sensors, ES), 2022
We present a QCL based absorption spectroscopy setup with a Stirling cooled circular multipass absorption cell at 150 K. We report the first high-precision measurements of clumped 12C18O2 and 12C17O18O, and of site-specific propane isotopomers.
Akshay Nataraj, Michele Gianella, Béla Tuzson, Gang Li, Volker Ebert, Jérôme Faist, Lukas Emmenegger   +6 more
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Photoassociative Spectroscopy and Formation of Cold Molecules

Physica Scripta, 2000
In the molecular photoassociation process, two free cold atoms absorb one photon by a resonant way, to create an excited molecule in a well defined ro-vibrational state. The photoassociative spectroscopy of alkaline dimers yields accurate determinations for the long-range parts of molecular potential curves correlated to the first s + p asymptote.
Pierre Pillet, Cyril Drag, Bruno Laburthe Tolra, Daniel Comparat, Andrea Fioretti, Samuel Guibal, Claude Amiot, Anne Crubellier, Olivier Dulieu, Fran?oise Masnou-Seeuws   +9 more
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Single-Molecule Spectroscopy of Cold Denaturation and the Temperature-Induced Collapse of Unfolded Proteins

Journal of the American Chemical Society, 2013
Recent Förster resonance energy transfer (FRET) experiments show that heat-unfolded states of proteins become more compact with increasing temperature. At the same time, NMR results indicate that cold-denatured proteins are more expanded than heat-denatured proteins.
Aznauryan, Mikayel, Nettels, Daniel, Holla, Andrea, Hofmann, Hagen, Schuler, Benjamin   +4 more
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Sub-Doppler laser spectroscopy of molecules and clusters in cold beams

Proceedings / Indian Academy of Sciences, 1991
This paper illustrates, with several examples, the spectral resolution and attainable sensitivity reached with sub-Doppler laser spectroscopy in cold argon beams, seeded with molecular or metal vapors. Linear as well as nonlinear spectroscopy has been applied. The detection techniques use either LIF or resonant two-photon ionization.
F. Bylicki, W. Demtröder, H. A. Eckel, J. Gress, E. Mehdizadeh, G. Persch   +5 more
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Infrared spectroscopy of cold molecules

2017
A long path collisional cooling cell has been installed at the Far-Infrared beamline at the Australian Synchrotron to study the infrared spectrum of molecules at cryogenic temperatures. New transfer optics and vacuum chambers were designed in order to allow study in the far infrared region where the synchrotron source provides the most advantage ...
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Fluorescence spectroscopy of cold and warm naphthalene molecules: Some new vibrational assignments

The Journal of Chemical Physics, 1981
The fluorescence excitation spectrum of naphthalene seeded in a supersonic free jet and the single vibronic level fluorescence spectrum of room temperature naphthalene vapor have been used to determine assignments for a number of combination and sequence transitions that were previously unassigned.
Fred M. Behlen, Daniel B. McDonald, V. Sethuraman, Stuart A. Rice   +3 more
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Spectroscopy of cold Cs2 molecules on helium nanodroplets

2004
In recent years, experiments with alkali doped helium nanodroplets have shown that alkali metal atoms remain on the helium surface where they “ skate” around and form molecules in cold collisions. The molecular binding energy is absorbed by the helium environment, which leads to evaporation of helium atoms until the cluster temperature has ...
Beuc, Robert, Pichler, Goran, Movre, Mladen   +2 more
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SO2 Revisited: laser spectroscopy of cold molecules and collission-induced electronic and rotational relaxation

Journal of Photochemistry, 1981
Abstract SO2 has an electronic absorption band in the UV and some of the rotational structures between 3000 and 3300 A have been assigned to the A 1A2← X 1A1 transition by Hamada and Merer (in 1974 - 1975). It is believed that the B 1B1← X 1A1 transition also lies in this wavelength range but extensive perturbations of the B ...
Edward K.C. Lee, Bruce G. MacDonald, Dennis L. Holtermann, Roger Nanes   +3 more
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