Natural Line Widths of Spectral Lines and Spectral Band Widths from Monochromators Determined by Means of Phase Contrast Interferences

1954 ◽  
Vol 1 (2) ◽  
pp. 73-80 ◽  
Author(s):  
Erik Ingelstam
Keyword(s):  
Phase Contrast ◽  
Spectral Band ◽  
Spectral Lines ◽  
Line Widths

CRDS study of auto-ionizing Rydberg states of argon in a microwave discharge This article is part of a Special Issue on Spectroscopy at the University of New Brunswick in honour of Colan Linton and Ron Lees.

2009 ◽  
Vol 87 (5) ◽  
pp. 575-581 ◽  
Author(s):  
B. M. van der Ende ◽  
C. Winslade ◽  
R. L. Brooks ◽  
R. H. deLaat ◽  
N. P.C. Westwood
Keyword(s):  
New Brunswick ◽  
Excited States ◽  
Microwave Discharge ◽  
Rydberg States ◽  
Spectral Lines ◽  
Optical Transitions ◽  
Single Source ◽  
Special Issue ◽  
Line Widths ◽  
The University

Optical transitions from two microwave discharge excited states of argon have been observed using cavity ring-down spectroscopy. These transitions originate on the high-lying levels, 3d[1/2] 1° and 3d[3/2] 2° , and terminate on the nf ′[5/2] Rydberg (n = 8 to 22) levels, which, except for n = 8, lie between the 2P3/2 and 2P1/2 ionization thresholds. In total, 24 such spectral lines have been observed. The quantum defect for the f ′ series has been measured and is compared to previously measured values. We observe a nearly threefold jump in line width in going from n = 8 to n = 9, below and above the 2P3/2 threshold, respectively. The line widths are broad and increase monotonically with n (above 9), in contrast to the narrowing of line widths usually observed. We cannot attribute this to a single source but conclude that collisional, quasielastic l-mixing of the nf ′[5/2] Rydberg states plays a significant role.

scholarly journals Fast Time-Resolution Spectroscopy of BW Vulpeculae

1980 ◽  
Vol 58 ◽  
pp. 329-335
Author(s):  
Arthur Young ◽  
Ingemar Furenlid
Keyword(s):  
Time Resolution ◽  
Equivalent Width ◽  
Spectral Band ◽  
Heat Engine ◽  
Spectral Lines ◽  
Fast Time ◽  
National Observatory ◽  
Resolution Capability

AbstractAn experimental Fairchild CCD-211 was placed in the 2.1-m coudé spectrograph at the Kitt Peak National Observatory and used to record an 87 Å spectral band centered on Hα. On the night of 1979 July 11 UT date, this system was used to observe continuously the extreme β Cephei variable BW Vulpeculae throughout one of its 4h 49m cycles with an average exposure of 13 minutes per observation. A total of 18 observations was secured. The results show dramatic profile variations of Hα, including features not previously reported, and extreme variations of the C II λλ6578, 6582 lines, including variations of equivalent width. The fast time-resolution capability and the photometric linearity of the CCD have permitted the detection of subtle effects that have been missed by photographic observations and has led directly to important new interpretations of the complex atmospheric pulsations in this star, including effects of altered opacity on the formation of spectral lines and the suggestion of a helium-ionization heat engine as a mechanism for driving atmospheric pulsations.

Thermal Shift and Broadening of Spectral Lines in Neodymium Doped Garnets

1999 ◽  
Vol 560 ◽  
Author(s):  
Xuesheng Chen ◽  
Baldassare Di Bartolo
Keyword(s):  
Line Width ◽  
Blue Shift ◽  
Red Shift ◽  
Spectral Lines ◽  
Temperature Range ◽  
Different Temperatures ◽  
Line Widths ◽  
Increasing Temperature ◽  
Thermal Shift

ABSTRACTThermal shift and broadening of sharp luminescence lines in three Nd-doped laser garnet crystals, GGG, GSGG, and CYMGG, are investigated in a temperature range of 78 to 600K. These lines are due to the 4F3/2 → 4I9/2 (∼0.94μ) and 4F3/2 → 4I11/2 (∼lμ) transitions. Line widths and positions at different temperatures are reported for the lines of RI→Yl, RI→Y2, R2→Y3, RI→Z5 in GGG:Nd, RI→Y1, RI→Y2, R2→Y1, R2→Y3, RI→Y6, R2→Y6, RI→Z5 in GSGG:Nd,Cr, and R2→Y1, RI→Z5 in CYMGG:Nd,Cr. We observed that all the lines shift to longer wavelengths (red shift) with increasing temperature except for the R1,2 →Z5 lines that shift to shorter wavelength (blue shift) in all the three garnet crystals. For the widths, all the lines become broader with increasing temperature. It was also observed that the line width in the germanium garnet CYMGG is much broader than in GGG and GSGG.

Microphotometric Errors for Photographically Recorded Spectral Lines of Nonuniform Half-Width

1978 ◽  
Vol 32 (5) ◽  
pp. 433-444 ◽  
Author(s):  
L. C. McGonagle ◽  
J. A. Holcombe
Keyword(s):  
Line Width ◽  
Half Width ◽  
Slit Width ◽  
Spectral Lines ◽  
Average Error ◽  
Spatially Resolved ◽  
Source Line ◽  
Line Widths ◽  
Spectrometer Slit ◽  
The Impact

Various microphotometric (or densitometric) techniques for generating quantitative intensity information from photographically recorded spectral lines of time or spatially resolved sources are discussed. The impact of various parameters on the accuracy of quantitative densitometry is presented. These parameters include line widths of the calibration spectrum, source line broadening, microphotometer scan slit width and the optical density of the photographic image. Nonrandom errors associated with the use of various microphotometer slit widths for spectral lines of nonuniform half-width are presented. Spectral lines which are uniform and exhibit slit width or diffraction limited resolution can be scanned with any size microphotometer slit width as long as the calibration curve is prepared using the same scan slit width. The use of microphotometer slit widths narrower than the line width produce H and D curves with maximal γ and increased accuracy in the final intensity value. A density-to-intensity conversion accuracy with a 6% average error was determined for SA-1 plates. For sources whose line widths are larger than the spectrometer bandpass, minimal errors are generated by using a narrow line source for calibration and scanning this spectrum with a slit width less than the line width. Scanning of the broadened line of interest is accomplished using a scan slit width equal to approximately twice the spectrometer slit width. Under these conditions an average error of approximately 11% was determined experimentally for SA-1 plates.

scholarly journals Theoretical Stark Broadening Parameters for UV–Blue Spectral Lines of Neutral Vanadium in the Solar and Metal-Poor Star HD 84937 Spectra

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 64
Author(s):  
Cristóbal Colón ◽  
María Isabel de Andrés-García ◽  
Lucía Isidoro-García ◽  
Andrés Moya
Keyword(s):  
Spectral Lines ◽  
Matrix Elements ◽  
Stark Broadening ◽  
Laboratory Plasma ◽  
Hartree Fock ◽  
The Matrix ◽  
Line Widths ◽  
And Shifts ◽  
Semi Empirical ◽  
Metal Poor Star

Using Griem’s semi-empirical approach, we have calculated the Stark broadening parameters (line widths and shifts) of 35 UV–Blue spectral lines of neutral vanadium (V I). These lines have been detected in the Sun, the metal-poor star HD 84937, and Arcturus, among others. In addition, these parameters are also relevant in industrial and laboratory plasma. The matrix elements required were obtained using the relativistic Hartree–Fock (HFR) method implemented in Cowan’s code.

scholarly journals Stark broadening parameter tables for neutral zinc spectral lines

1999 ◽  
pp. 21-33 ◽  
Author(s):  
M.S. Dimitrijevic ◽  
S. Sahal−Bréchot
Keyword(s):  
Spectral Lines ◽  
Stark Broadening ◽  
Semiclassical Approach ◽  
Line Widths ◽  
And Shifts

Using a semiclassical approach, we have calculated electron?, proton? and He II?impact line widths and shifts for 32 Zn I multiplets as a function of temperature and perturber density.

N.M.R. spectra of the carbolines. II. 14N quadrupolar and exchange broadening of spectral lines

1973 ◽  
Vol 26 (7) ◽  
pp. 1523 ◽  
Author(s):  
F Balkau ◽  
ML Heffernan
Keyword(s):  
Pyridine Ring ◽  
Chemical Exchange ◽  
Spectral Lines ◽  
Line Broadening ◽  
Quadrupolar Relaxation ◽  
Line Widths ◽  
Exchange Broadening

The n.m.r, spectra of carbazole and the carbolines were previously reported to show unusual line broadening effects under certain conditions. It is found that for the proton in position 9 both chemical exchange and 14N quadrupolar relaxation are responsible for the large line widths observed, while for protons in the ?pyridine? ring chemical exchange is the more important effect. The nature of this exchange is still uncertain, the rate being critically dependent on solvent and sample purity as well as temperature.

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