High-Resolution Laser Excitation Spectra of theA2Π ←X2Σ+System of SrBr: The 0–0 and 1–0 Bands of Sr79Br and Sr81Br

1998 ◽  
Vol 190 (1) ◽  
pp. 150-156 ◽  
Author(s):  
John A. Coxon ◽  
Cameron S. Dickinson
Keyword(s):  
High Resolution ◽  
Laser Excitation ◽  
Excitation Spectra

Spectroscopy of metastable species in a free-jet expansion: the β ← A transition in IBr

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1294-1306 ◽  
Author(s):  
Jason O. Clevenger ◽  
Quentin P. Ray ◽  
Joel Tellinghuisen ◽  
Xiaonan Zheng ◽  
Michael C. Heaven
Keyword(s):  
High Resolution ◽  
Laser Irradiation ◽  
Laser Excitation ◽  
Excitation Spectra ◽  
Detailed Characterization ◽  
Free Jet ◽  
X State ◽  
Π State ◽  
Existing Data

The A 1(3Π) state of IBr is observed in a free-jet expansion of IBr in Ar, following photolysis with ArF laser irradiation. Laser excitation spectra are obtained for the β 1(3P2) ← A transition in medium (0.5 cm−1) and high (0.08 cm−1) resolution. Sixteen ν′–ν″ bands recorded in high resolution are rotationally analyzed, providing the first detailed characterization of the lowest three νlevels in the A state. An additional ~50 bandheads in the ν″ = 0 and 1 progressions are recorded for both I79Br and I81Br. The new data, which sample ν′ levels in the range 31–71, are combined with existing information for low ν in the β state to provide improved constants for the β state. These results are merged with least-squares parameters from a detailed reanalysis of existing data for the A and X(1Σ+) states to yield spectroscopic parameters valid for ν = 0–20 in the X state and ν = 0–26 in the A state. Among these results are the first precise estimates of the equilibrium parameters in the A state: Te = 12 369.68 (14) cm−1, ωe = 134.22 (13) cm−1, Be = 0.042 40 (5) cm−1, Re = 2.8583 (16) Å.

High-resolution visible spectrum for the A3Π(l)–X1Σ+ system of IBr

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1265-1272 ◽  
Author(s):  
Dominique R. T. Appadoo ◽  
Peter F. Bernath ◽  
Robert J. Le Roy
Keyword(s):  
High Resolution ◽  
Mechanical Behaviour ◽  
Laser Excitation ◽  
Visible Spectrum ◽  
Molecular Constants ◽  
Excitation Spectra ◽  
The Core ◽  
Global Fit ◽  
X State ◽  
Infrared Data

New high-resolution absorption and laser excitation spectra of the A3Π(1)–X1Σ+ system of IBr, consisting of approximately 4000 lines of over 40 bands spanning the vibrational range ν′ = 6–29 and ν″ = 1–4 for each of the two isotopomers, have been recorded and analyzed. Combined with previous microwave and infrared data and fluorescence progressions into the X state, and with new data obtained from laser excitation of the lowest levels of the A state, they formed the core of a global fit to mass-reduced Dunham expansions that yields new molecular constants for the A and X states of I79Br and I81Br. Inability to fully account for all data within the experimental uncertainties points to the existence of substantial perturbations or "non-mechanical" behaviour for A-state levels ν′ > 24.

Rotational analysis of the laser excitation spectra of the bromoacetylene and deuterobromoacetylene cations

1984 ◽  
Vol 62 (12) ◽  
pp. 1437-1451 ◽  
Author(s):  
Michael A. King ◽  
John P. Maier ◽  
Liubomir Misev ◽  
Martin Ochsner
Keyword(s):  
Electronic Structure ◽  
High Resolution ◽  
Laser Excitation ◽  
Neutral Molecule ◽  
Rotational Analysis ◽  
Excitation Spectra

High-resolution laser excitation spectra of the [Formula: see text] bands of the bromo- and deuterobromoacetylene cations have been recorded and rotationally analyzed. The new data are compared with those for the neutral molecule and discussed in terms of electronic structure.

High-resolution laser-excitation spectrum of the A2Π ← X2Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands

1985 ◽  
Vol 63 (7) ◽  
pp. 997-1004 ◽  
Author(s):  
K. Brabaharan ◽  
J. A. Coxon ◽  
A. Brian Yamashita
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Excitation Spectrum ◽  
Laser Excitation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Individual Bands ◽  
Measured Line ◽  
Line Positions ◽  
Π State

The 0–0, 1–1, and 2–2 bands of the A2Π ← X2Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A2Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.

Resonant Photoluminescence Excitation in GaAs Grown Directly on Si

1988 ◽  
Vol 116 ◽  
Author(s):  
S. Zemon ◽  
C. Jagannath ◽  
S. K. Shastry ◽  
W. J. Miniscalco ◽  
G. Lambert
Keyword(s):  
Ground State ◽  
Heavy Hole ◽  
Laser Excitation ◽  
Free Exciton ◽  
Light Hole ◽  
The Other ◽  
Organometallic Vapor Phase Epitaxy ◽  
Photoluminescence Excitation ◽  
Excitation Spectra ◽  
Excitation Line

AbstractWe describe new results observed during resonant excitation in the excitonic region of GaAs grown directly on Si by organometallic vapor phase epitaxy. Two resolved features were found in the light hole photoluminescence (PL) region, one identified with a free exciton process and the other with donor-related transitions. Features which track the laser excitation line were observed and identified with a process in which a donor is excited from the n=l ground state to an n=2 excited state. The PL excitation spectra associated with these features have spectral widths as narrow as 1.5 meV. PL spectral widths of ~3 meV have been attained for the heavy hole exciton band, representing the narrowest value obtained for OMVPE material and an improvement of about 30% over our best previous results.

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