scholarly journals High Resolution Spectroscopy With Molecular Beams and Tunable Lasers

1998 ◽  
Vol 18 (1-2) ◽  
pp. 1-11 ◽  
Author(s):  
R. Vetter ◽  
P. Luc ◽  
C. Amiot
Keyword(s):  
Electronic Structure ◽  
High Resolution ◽  
Diatomic Molecules ◽  
Reaction Dynamics ◽  
Molecular Beams ◽  
Tunable Lasers ◽  
High Resolution Spectroscopy ◽  
Absorption Bands ◽  
Quantum Numbers ◽  
Laser Techniques

High resolution Doppler-free laser techniques are used in beam experiments to improve the spectroscopic description of complex diatomic molecules. The case of TiO is considered here for its implication in reaction dynamics studies and its interest in Astrophysics. Two absorption bands in the visible have been analyzed: B3Π−X3 Δ(1−0) and c1Φ−a1 Δ(0−0). Owing to accurate wavenumber measurements, it has been possible to extend the analysis to high rotational quantum numbers and to carry out detailed spectroscopic calculations. They show that a careful revisiting of the TiO electronic structure is necessary.

The high-resolution spectroscopy of dissociating molecules

1990 ◽  
Vol 332 (1625) ◽  
pp. 297-307 ◽  
Keyword(s):  
High Resolution ◽  
Energy Flow ◽  
Energy State ◽  
Reaction Dynamics ◽  
Theoretical Models ◽  
Spectroscopic Studies ◽  
High Resolution Spectroscopy ◽  
Bond Breaking ◽  
Vibrational Levels ◽  
Dynamical Constraints

Results from spectroscopic studies of the vibrational levels of dissociating molecules and from state-selected, state-resolved photofragmentation spectroscopy are presented. The extent of energy flow among the modes of a molecule is explored through the couplings, or lack thereof, revealed by high-resolution spectroscopy. The dynamics of energy flow during bond breaking are revealed by photofragment excitation spectroscopy and by product energy state distributions. These completely resolved data provide sensitive tests of dynamical constraints such as vibrational or rotational adiabaticity and thus of theoretical models for unimolecular reaction dynamics.

Studies of the Kerr Effect in High Resolution Spectroscopy

1971 ◽  
Vol 49 (7) ◽  
pp. 914-931 ◽  
Author(s):  
J. M. Brown ◽  
A. D. Buckingham ◽  
D. A. Ramsay
Keyword(s):  
High Resolution ◽  
Kerr Effect ◽  
High Resolution Spectroscopy ◽  
Quarter Wave Plate ◽  
Order Effects ◽  
Absorption Bands ◽  
Stark Effects ◽  
Quarter Wave ◽  
Symmetric Top Molecules ◽  
Kerr Constants

The general theory of the Kerr effect in the region of absorption bands is described. Expressions are derived for the Kerr constants B[=(nz − nx)ω/2πcFz2] and B′[=(kz − kx)ω/2πcFz2] for symmetric top molecules at frequencies close to transitions involving levels with K ≠ 0. The application of the theory to asymmetric top molecules and the inclusion of second-order effects are discussed.Kerr spectra of the 3390 Å band of formaldehyde and of the 3821 Å band of propynal have been photographed under high resolution. The most prominent lines in these spectra are those which show predominantly first-order Stark effects. Photoelectric methods are described involving (a) a rotating quarter-wave plate and (b) a rotating polarizer; they permit the recording of the pure birefringence (B) and pure dichroism (B′) respectively.

Decelerated molecular beams for high-resolution spectroscopy

2004 ◽  
Vol 31 (2) ◽  
pp. 337-349 ◽  
Author(s):  
J. Veldhoven ◽  
J. K�pper ◽  
H. L. Bethlem ◽  
B. Sartakov ◽  
A. J. A. Roij ◽  
...  
Keyword(s):  
High Resolution ◽  
Molecular Beams ◽  
High Resolution Spectroscopy

High Resolution Spectroscopy of HCN Isotopomers: H13CN, HC15N, and H13C15N in the Ground and First Excited Bending Vibrational State

2004 ◽  
Vol 59 (11) ◽  
pp. 861-874 ◽  
Author(s):  
U. Fuchs ◽  
S. Brünken ◽  
G.W. Fuchs ◽  
S. Thorwirth ◽  
V. Ahrens ◽  
...  
Keyword(s):  
High Resolution ◽  
Vibrational State ◽  
High Resolution Spectroscopy ◽  
Molecular Constants ◽  
Data Set ◽  
Quantum Numbers ◽  
Terahertz Applications ◽  
Global Fit ◽  
Mode A ◽  
Wave Spectrometer

The eleven energetically lowest pure rotational transitions, J ←J−1 (J =1,2, . . . ,11), of H13CN, H13C15N, and HC15N in the ground and first excited bending state were measured. By operating the Cologne Tetrahertz Wave Spectrometer up to 1 THz in the sub-Doppler mode, a transition frequency accuracy of a few kHz is achieved. These measurements were carried out at frequencies between 80 - 950 GHz. In addition, some transitions of the three isotopomers with rotational quantum numbers J = 20,21,22,23 have been measured in Doppler-limited resolution near 2 THz, using the frequency stabilized Cologne Sideband Spectrometer for Terahertz Applications (COSSTA). Furthermore, direct l-type transitions of H13CN in the first excited bending state with J up to 35 have been measured. These new data are of particular importance, since we discovered highly excited circumstellar H12CN recently. A global fit of the newly enlarged data set together with existing carefully screened ro-vibrational data yields molecular constants which are highly reliable and of great importance both for astrophysical observations and laboratory applications

Sign in / Sign up

Export Citation Format

Share Document