High-Resolution Line-Intensity Measurements Of The V4 + V5 Band Of Acetylene

1983 ◽  
Author(s):  
Max Loewenstein ◽  
James R. Podolske ◽  
Prasad Varanasi
Keyword(s):  
High Resolution ◽  
Line Intensity ◽  
Intensity Measurements

scholarly journals Line Intensity Measurements of the ν7+ν8 Band of Ethylene (12C2H4)

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
G. B. Lebron ◽  
T. L. Tan
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Line Intensity ◽  
Line Intensities ◽  
Intensity Measurements ◽  
Hamiltonian Model ◽  
Absorbance Spectra

From the four high-resolution FTIR absorbance spectra recorded at a spectral resolution of 0.0063 cm−1, 123 line intensities belonging to the ν7+ν8 band of 12C2H4 were measured and fit. The upper v7+v8=1 state rovibrational constants up to sextic terms determined using a Watson's A-reduced Hamiltonian model in Ir representation were used to calculate the line intensities of the band. Results of the experimental fit of the line intensities agree well with those obtained by calculations.

RELATIVE TRANSITION PROBABILITIES IN NEON

1966 ◽  
Vol 44 (8) ◽  
pp. 1781-1786 ◽  
Author(s):  
J. C. Irwin ◽  
R. A. Nodwell
Keyword(s):  
Emission Line ◽  
Line Intensity ◽  
Transition Probabilities ◽  
Atomic Transition ◽  
Temperature Measurements ◽  
Intensity Measurements ◽  
Relative Transition ◽  
Reversal Temperature

The relative atomic transition probabilities for the transitions between the 2p53p and 2p53s configurations of NeI have been measured by combining reversal temperature measurements with relative emission line intensity measurements. The relative emission intensities were corrected for self-absorption. The results are compared with those obtained by previous workers.

On the CH4 nu-4 fundamental controversy - Line-intensity measurements revisited

1979 ◽  
Vol 227 ◽  
pp. 334 ◽  
Author(s):  
B. L. Lutz ◽  
R. W. Boese ◽  
P. M. Silvaggio
Keyword(s):  
Line Intensity ◽  
Intensity Measurements

scholarly journals Comparing the emission spectra of U and Th hollow cathode lamps and a new U line list

2018 ◽  
Vol 618 ◽  
pp. A118 ◽  
Author(s):  
L. F. Sarmiento ◽  
A. Reiners ◽  
P. Huke ◽  
F. F. Bauer ◽  
E. W. Guenter ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Hollow Cathode ◽  
Line Intensity ◽  
Line Strength ◽  
Emission Spectra ◽  
Emission Lines ◽  
Line List ◽  
Line Intensity Ratio ◽  
Suitable Combination

Context. Thorium hollow cathode lamps (HCLs) are used as frequency calibrators for many high resolution astronomical spectrographs, some of which aim for Doppler precision at the 1 m s−1 level. Aims. We aim to determine the most suitable combination of elements (Th or U, Ar or Ne) for wavelength calibration of astronomical spectrographs, to characterize differences between similar HCLs, and to provide a new U line list. Methods. We record high resolution spectra of different HCLs using a Fourier transform spectrograph: (i) U–Ne, U–Ar, Th–Ne, and Th–Ar lamps in the spectral range from 500 to 1000 nm and U–Ne and U–Ar from 1000 to 1700 nm; (ii) we systematically compare the number of emission lines and the line intensity ratio for a set of 12 U–Ne HCLs; and (iii) we record a master spectrum of U–Ne to create a new U line list. Results. Uranium lamps show more lines suitable for calibration than Th lamps from 500 to 1000 nm. The filling gas of the lamps significantly affects their performance because Ar and Ne lines contaminate different spectral regions. We find differences (up to 88%) in the line intensity of U lines in different lamps from the same batch. We find 8239 isolated lines between 500 and 1700 nm that we attribute to U, 3379 of which were not contained in earlier line lists. Conclusions. We suggest using a combination of U–Ne and U–Ar lamps to wavelength-calibrate astronomical spectrographs up to 1 μm. From 1 to 1.7 μm, U–Ne shows better properties. The differences in line strength between different HCLs underline the importance of characterizing HCLs in the laboratory. The new 3379 U lines can significantly improve the radial velocity precision of astronomical spectrographs.

Absorption intensity measurements of the first overtone band of CO

1981 ◽  
Vol 59 (10) ◽  
pp. 1367-1372 ◽  
Author(s):  
G. Chandraiah ◽  
G. R. Hébert
Keyword(s):  
Carbon Monoxide ◽  
Line Intensity ◽  
Absolute Intensity ◽  
Intensity Data ◽  
Pressure Broadening ◽  
Absorption Intensity ◽  
Overtone Band ◽  
Intensity Measurements ◽  
Best Value ◽  
Measured Line

The absolute intensity A2–0 of the 2–0 band of carbon monoxide has been measured with helium and argon as pressure broadening gases at pressures up to 600 amagat. A separate band intensity value has been derived from the measurements of several P-branch line intensity data and the Herman–Wallis formula. The best value obtained is A2–0 = (2.11 ± 0.08) cm−2 amagat−1. The square of the rotationless matrix element, [Formula: see text] has been found to be (4.39 ± 0.02)10−5 D2, as estimated from the measured line intensity values.

Absolute line intensity measurements in the ν2 bands of HDO and D2O using a tunable diode laser spectrometer

1986 ◽  
Vol 120 (2) ◽  
pp. 239-245 ◽  
Author(s):  
K.B. Thakur ◽  
Curtis P. Rinsland ◽  
Mary Ann H. Smith ◽  
D.Chris Benner ◽  
V. Malathy Devi
Keyword(s):  
Diode Laser ◽  
Line Intensity ◽  
Tunable Diode Laser ◽  
Laser Spectrometer ◽  
Diode Laser Spectrometer ◽  
Intensity Measurements
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