MEASUREMENT OF PRESSURE-BROADENING LINEWIDTHS OF NO FROM THE FITTING OF LMR SPECTRA WITH CORRECTIONS OF INSTRUMENTAL BROADENING

2000 ◽  
Vol 14 (11) ◽  
pp. 401-407 ◽  
Author(s):  
JIE-LI LIN ◽  
YU-YAN LIU ◽  
HONG-PING LIU ◽  
YUAN-QING QUO ◽  
XIAO-YONG LIU ◽  
...  
Keyword(s):  
Spectral Lines ◽  
Absorption Lines ◽  
Derivative Spectrum ◽  
Pressure Broadening ◽  
Fundamental Band ◽  
Band Spectra

For absorption lines, the distortion of spectral lines by experimental spectrometers must be considered in measuring linewidth which has been investigated by many authors. While in the derivative spectrum, we managed to give the corrections of instrumental broadening and distortion to obtain accurate linewidths. We developed a universal fitting program which was explored together with the method of correction in the fundamental band spectra of LMR of NO. The uncorrected halfwidths were compared with the corrected values, which were obtained from the program. The results of comparison are very satisfactory and demonstrate their useful application to analyze experimental spectra.

Measurement of the pressure-broadening coefficient of NO by saturation spectroscopy of LMR

2000 ◽  
Vol 78 (11) ◽  
pp. 989-995 ◽  
Author(s):  
Y Liu ◽  
J Lin ◽  
Y Guo
Keyword(s):  
Magnetic Resonance ◽  
Hyperfine Structure ◽  
Spectral Lines ◽  
The Self ◽  
Pressure Broadening ◽  
Fundamental Band ◽  
Saturation Spectroscopy ◽  
Intracavity Laser ◽  
Laser Magnetic Resonance

This paper presents a method for the determination of the pressure-broadening coefficient of 15N16O by 14N16O. The hyperfine-structure-resolved spectral lines of NO were obtained with an intracavity laser magnetic resonance spectrometer via Lamb dips. From the spectra, the self-broadening coefficient of the P2(5/2) transition of the 15N16O fundamental band due to its collision with 14N16O at 293 K is determined to be 0.092(7) cm–1/atm. PACS No.: 32.40

Profiles of Pressure Broadened Spectral Lines in an Arc Plasma

2005 ◽  
Vol 60 (10) ◽  
pp. 727-735
Author(s):  
Reda A. El-Koramy ◽  
Abd El-Halim A. Turky
Keyword(s):  
Alkali Metals ◽  
Stark Effect ◽  
Point Of View ◽  
Spectral Lines ◽  
Pressure Broadening ◽  
Static Approximation ◽  
Pressure Line ◽  
Pressure Profiles ◽  
Impact Approximation ◽  
Quadratic Stark Effect

Spectral analysis of the alkali metals is characterized by pressure profiles. In the present work an electric arc has been used to calibrate the half-width of the intensity used in the construction of the ArI natural line at 4300 Å with a trace of evaporated rubidium at pressures of 1, 2 and 3 atmospheres. The results agree well with those obtained by Kusch’s line absorption equation in an electric furnace in the point of view of impact approximation, showing that the widths of the lines have Lorentz shapes. It is found that a simple treatment can be given using the quasi-static approximation of pressure broadening developed by Unsöld. The agreement of the results is good only if the shifts are large. The study shows that the pressure line profile is made up of a sum of dispersion profiles and asymmetric terms which arise from interactions of quadratic Stark effect, commonly assumed to be the force in causing foreign gas broadening

General Theory of Pressure Broadening of Spectral Lines

1945 ◽  
Vol 68 (3-4) ◽  
pp. 78-93 ◽  
Author(s):  
Alexander Jabloński
Keyword(s):  
General Theory ◽  
Spectral Lines ◽  
Pressure Broadening

Theory of Pressure Broadening of Microwave Spectral Lines

1969 ◽  
Vol 182 (1) ◽  
pp. 24-38 ◽  
Author(s):  
Joel I. Gersten ◽  
Henry M. Foley
Keyword(s):  
Spectral Lines ◽  
Pressure Broadening

On the combined Doppler and pressure broadening of nonresonant spectral lines

1988 ◽  
Vol 66 (4) ◽  
pp. 341-348
Author(s):  
M. A. Diaz ◽  
F. Palomares ◽  
J. Veguillas
Keyword(s):  
Kinetic Equation ◽  
Inelastic Collisions ◽  
Spectral Lines ◽  
The Other ◽  
Low Density ◽  
Doppler Broadening ◽  
Equation Approach ◽  
Pressure Broadening ◽  
Debye Relaxation ◽  
Collision Model

An explicit spectral function for nonresonant transitions has been derived that includes pressure broadening, Doppler broadening, and diffusional narrowing. This has been accomplished through a kinetic-equation approach. The kinetic equation has been resolved by using an extension of the Bhatnagar–Gross–Krook collision model to inelastic collisions, characterized by two collision frequencies: one associated with elastic collisions and the other associated with inelastic ones. The high- and low-density limits have been discussed, and the standard formula for Debye relaxation has been reproduced. Finally, a discussion concerning the above aspects and their possible extensions has been included as well.

scholarly journals Isotope shift in the resonance line of magnesium

1936 ◽  
Vol 154 (883) ◽  
pp. 679-683 ◽  
Keyword(s):  
Emission Line ◽  
Hyperfine Structure ◽  
Atomic Beam ◽  
Resonance Line ◽  
Isotope Shift ◽  
Wave Length ◽  
Spectral Lines ◽  
The Other ◽  
Absorption Lines ◽  
Doppler Width

By making use of an atomic beam instead of an ordinary gas or vapour, it is possible to observe structures of spectral lines very much smaller than the normal Doppler width. The structure of resonance lines can thus be observed as fine absorption lines on the background of the emission line possessing the full Doppler width. This method was used by the present authors for the detection and measurement of the hyperfine structure of the resonance lines of potassium and sodium. The following paper gives an account of the investigation of the structure of the singlet resonance line (2852 A) of magnesium by the same method. The line was found to possess two components at a separation of 0.033 cm -1 , the component of longer wave-length being very much stronger than the other.

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