The temperature dependence of the 8920 Å band of NO2 and the location of the 000–000 band of the transition

1978 ◽  
Vol 56 (7) ◽  
pp. 838-845 ◽  
Author(s):  
A. J. Merer ◽  
K-E. J. Hallin
Keyword(s):  
Wavelength Region ◽  
High Dispersion ◽  
Absorption Bands ◽  
Temperature Spectrum ◽  
Vibrational Levels ◽  
Room Temperature Spectrum ◽  
Band Absorption ◽  
Hot Band ◽  
Franck Condon ◽  
Good Agreement

The absorption spectrum of NO2 cooled to −30 °C has been photographed at high dispersion in the wavelength region 8200–9100 Å. Comparison with the room temperature spectrum shows that weak absorption from the ground state of the molecule underlies slightly stronger 'hot' band absorption at 8920 Å. Franck–Condon calculations based on the relative intensities of absorption bands from the 000 and 010 vibrational levels of the molecule indicate that the 000–000 band of the [Formula: see text] electronic transition lies near 10250 Å (1.21 eV) with a possible uncertainty of one quantum of ν2′ (0.09 eV). This result is in good agreement with the multiconfiguration SCF calculations of Gillispie and Khan (which are at variance with previous experimental deductions on the location of the 000–000 band).Some new assignments have been made in the rotational structure of the 8360 Å band.

Rotational analysis of the A 0 u + , B 0 u + — X 0 g + systems of gaseous Te 2

1972 ◽  
Vol 327 (1569) ◽  
pp. 279-287 ◽  
Keyword(s):  
Wavelength Region ◽  
Lower State ◽  
Rotational Analysis ◽  
Absorption Bands ◽  
Small Perturbations ◽  
Vibrational Levels

A detailed rotational analysis has been made of 114 absorption bands of the main systems of 128 Te 2 and 130 Te 2 in the wavelength region 385.5 to 523.5 nm (3855 to 5235 Å). In addition eight emission bands of 128 Te 2 between 617 and 634 nm (6170 and 6340 Å) have been analysed. Only one lower state, the 0 g + component of 3 ∑ g – , has been recognized, but the bands involve two upper states, B 0 u + , which has been known for many years, and a new lower lying state of the same character, A 0 u + . The vibrational numbering in both transitions has been established. The levels in B 0 u + are subject to numerous small perturbations and to a large homogeneous perturbation for v ≽ 20. The vibrational levels in A 0 u + extrapolate smoothly to a limit at about 25920 cm -1 above v " = 0. If the products at this limit are Te( 3 P 2 ) + Te( 3 P 0 ), D 0 0 = 21210 cm -1 (2.63 eV). Other constants (cm -1 , for 130 Te 2 ) are as follows: state T e ω e x e ω e 10 3 y e ω e 10 2 B e 10 4 α e r e /nm r e /Å B 0 u + 22207.4 162.3 0.45 –11.09 3.254 1.25 0.2824 2.824 A 0 u + 19450.8 143.6 0.45 –3.892 3.124 1.30 0.2882 2.882 X 0 g + 0 247.07 0.515 –0.55 3.968 1.06 0.25774 2.5774

CS2+(B2Σu+, A2Πu → X2Πg) Fluorescence from Photoionization Excitation of CS2 Vapor

1975 ◽  
Vol 53 (19) ◽  
pp. 1861-1868 ◽  
Author(s):  
L. C. Lee ◽  
D. L. Judge ◽  
M. Ogawa
Keyword(s):  
Cross Sections ◽  
Production Cross ◽  
Orbit Interaction ◽  
Emission Lines ◽  
Rydberg Series ◽  
Absorption Bands ◽  
Vibrational Levels ◽  
Splitting Constant ◽  
High Production ◽  
Good Agreement

CS2+(B2Σu+, A2Πu → X2Πg) fluorescence bands produced by irradiation of CS2 vapor with emission lines from λλ462–977 Å were analyzed and their production cross sections measured. The assignments for the emission bands of the bending transitions, B2Σu+(0ν0) → X2Πg(0ν0), have been suggested. Using the tentatively assigned positions of the band heads for the A2Πu(ν00) → X2Πg(000) transitions the ionization potentials for the A2Πu(ν00) vibrational levels were obtained and found to be in good agreement with the photoelectron data. The splitting constant of the spin–orbit interaction for the A2Πu state was thereby determined to be 169 ± 20 cm−1. The CS2+(A2Πu, B2Σu+ → X2Πg) fluorescence has exceptionally high production cross sections at the absorption bands associated with the n = 3 members of the Rydberg series III and V.

Fourier transform spectroscopy of the Herzberg I bands of O2

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1101-1108 ◽  
Author(s):  
K. Yoshino ◽  
J. E. Murray ◽  
J. R. Esmond ◽  
Y. Sun ◽  
W. H. Parkinson ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Wavelength Region ◽  
Rotational Line ◽  
Molecular Constants ◽  
Absorption Bands ◽  
Weakly Bound ◽  
Vibrational Levels ◽  
J 13 ◽  
Line Positions ◽  
Made In

Fourier transform spectroscopic measurements of the absorption bands of the Herzberg I system [Formula: see text] of O2, have been made in the wavelength region 240–270 nm. Rotational line positions are determined with an accuracy of 0.005 cm−1, and rotational term values are presented for the vibrational levels, ν = 4–11. Molecular constants of these levels are also presented. Interactions with the [Formula: see text] state are observed at J = 13 of the ν = 4 level, at J = 16 of the ν = 7 level, and at J = 15 and 24 of the ν = 9 level of the [Formula: see text] state. Another interaction around J = 10 of the ν = 11 level might result from the weakly bound 3Πu state.

scholarly journals Lateral PbS Photovoltaic Devices for High Performance Infrared and Terahertz Photodetectors

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1692
Author(s):  
Emmanuel K. Ampadu ◽  
Jungdong Kim ◽  
Eunsoon Oh
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Photovoltaic Device ◽  
Photovoltaic Devices ◽  
Temperature Spectrum ◽  
Terahertz Region ◽  
Room Temperature Spectrum ◽  
Ftir Spectrometer ◽  
Titanium Substrates ◽  
Deposition Conditions

We fabricated a lateral photovoltaic device for use as infrared to terahertz (THz) detectors by chemically depositing PbS films on titanium substrates. We discussed the material properties of PbS films grown on glass with varying deposition conditions. PbS was deposited on Ti substrates and by taking advantage of the Ti/PbS Schottky junction, we discussed the photocurrent transients as well as the room temperature spectrum response measured by Fourier transform infrared (FTIR) spectrometer. Our photovoltaic PbS device operates at room temperature for wavelength ranges up to 50 µm, which is in the terahertz region, making the device highly applicable in many fields.

scholarly journals A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hua-Tian Tu ◽  
An-Qing Jiang ◽  
Jian-Ke Chen ◽  
Wei-Jie Lu ◽  
Kai-Yan Zang ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
Wavelength Region ◽  
Ultra Violet ◽  
High Spectral Resolution ◽  
Visible Range ◽  
High Dispersion ◽  
Charge Coupled Device ◽  
Wide Range ◽  
High Resolution Spectrometer

AbstractUnlike the single grating Czerny–Turner configuration spectrometers, a super-high spectral resolution optical spectrometer with zero coma aberration is first experimentally demonstrated by using a compound integrated diffraction grating module consisting of 44 high dispersion sub-gratings and a two-dimensional backside-illuminated charge-coupled device array photodetector. The demonstrated super-high resolution spectrometer gives 0.005 nm (5 pm) spectral resolution in ultra-violet range and 0.01 nm spectral resolution in the visible range, as well as a uniform efficiency of diffraction in a broad 200 nm to 1000 nm wavelength region. Our new zero-off-axis spectrometer configuration has the unique merit that enables it to be used for a wide range of spectral sensing and measurement applications.

scholarly journals Bichromatic Photoassociation Spectroscopy for the Determination of Rotational Constants of Cs2 0 u + Long-Range State below the 6S1/2 + 6P1/2 Asymptote

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3963
Author(s):  
Jizhou Wu ◽  
Jie Ma ◽  
Yuqing Li ◽  
Wenliang Liu ◽  
Peng Li ◽  
...  
Keyword(s):  
Long Range ◽  
Spectroscopic Technique ◽  
Rigid Rotor ◽  
Simple Analysis ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Photoassociation Spectroscopy ◽  
Rotor Model ◽  
Good Agreement

This article demonstrates new observation of the high-resolution ro-vibrational bichromatic photoassociation spectra (BPAS) of Cs2 in the 0u+ long-range state below the asymptotes 6S1/2 + 6P1/2. By combining with a modulation spectroscopic technique, precise references of the frequency differences have been engineered through the BPAS, with which the rotational constants of low-lying vibrational levels of the Cs20u+ long-range state have been accurately determined by fitting the frequency differences to the non-rigid-rotor model. The rotational constants for the newly observed seven ro-vibrational levels are summarized and disagreement for the level ῦ = 498 is clarified. The rotational constants of different vibrational levels demonstrate strong perturbations of the related energy structures. A simple analysis is performed and shows good agreement with experimental results.

ELECTRONIC STRUCTURE AND OPTICAL PROPERTIES OF CRYSTALLINE C60

1992 ◽  
Vol 06 (06) ◽  
pp. 309-321 ◽  
Author(s):  
W.Y. CHING ◽  
MING-ZHU HUANG ◽  
YONG-NIAN XU ◽  
FANQI GAN
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
First Principles ◽  
Optical Spectrum ◽  
Local Density ◽  
Low Dielectric Constant ◽  
Experimental Measurements ◽  
Absorption Bands ◽  
Low Dielectric ◽  
Good Agreement

The electronic structure and optical properties of crystalline C 60 and their pressure dependence have been studied by first-principles local density calculations. It is shown that fcc C 60 has a low dielectric constant and an optical spectrum rich in structures. The spectrum shows five disconnected absorption bands in the 1.4 to 7.0 eV region with sharp structures in each band that can be attributed to critical point transitions. This is a manifestation of the localized molecular structure coupled with long range crystalline order unique to the C 60 crystal. At a sufficient high pressure, the structures in the optical spectrum start to merge due to the merging of the bands. These results are in good agreement with some recent experimental measurements.

Vibration-rotation bands and rotational constants of dideuteroacetylene

1955 ◽  
Vol 232 (1190) ◽  
pp. 291-309 ◽  
Keyword(s):  
Resolving Power ◽  
Vibrational States ◽  
Absorption Bands ◽  
Rotational Constants ◽  
Vibrational Assignments ◽  
Vibrational Anharmonicity ◽  
A Value ◽  
Vibrational Levels ◽  
Vibration Rotation ◽  
Very High

Nine vibrational absorption bands of dideutero-acetylene have been examined with very high resolving power. The rotational constants have been determined for the vibrational levels concerned, and the coefficients α i have been determined with more convincing accuracy than previously. In some of the bands the Q branches have been resolved, so that the l -doubling coefficients q i could be derived, and details could be established about the doublet components in some II levels. The results emphasize the need of high resolution if the vibrational assignments are to be unambiguous, and if reliable values of the rotational constants are to be derived. A value of B e has been obtained, and the vibrational anharmonicity coefficients have been considered briefly. Estimates of the centrifugal stretching constants D i in different vibrational states have been made, and one anomalous case has been found.

Fluorine mean-life measurements below 1000 Å using the beam–foil technique

1976 ◽  
Vol 54 (10) ◽  
pp. 1014-1021 ◽  
Author(s):  
E. H. Pinnington ◽  
D. J. G. Irwin ◽  
A. E. Livingston ◽  
J. A. Kernahan
Keyword(s):  
Satellite Data ◽  
Wavelength Region ◽  
Wave Functions ◽  
Interstellar Clouds ◽  
Beam Foil ◽  
Foil Technique ◽  
Good Agreement

We have used the beam–foil technique to measure mean lives for 16 transitions in F I–F IV in the wavelength region 400 Å–1000 Å. Good agreement is found with the results of recent calculations, particularly those employing correlated wave functions. The f-value trends for 5 isoelectronic sequences are presented in detail (2p5 2P0–2p43s2 D and 2p5 2P0–2p43s 2P in F I; 2p4 3P–2p33s 3D0 in F II; 2p3 2D0–2s2p4 2D and 2p3 4S0–2s2p4 4P in F III). Our f value for the 955 Å multiplet in F I is also used in conjunction with some new satellite data to show that the fluorine abundance is apparently depleted in interstellar clouds by a factor of at least 3 below its solar value.

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