scholarly journals Origin band of the first photoionizing transition of hydrogen isocyanide

2019 ◽  
Vol 21 (5) ◽  
pp. 2337-2344 ◽  
Author(s):  
Bérenger Gans ◽  
Gustavo A. Garcia ◽  
Séverine Boyé-Péronne ◽  
Stephen T. Pratt ◽  
Jean-Claude Guillemin ◽  
...  
Keyword(s):  
Photon Energy ◽  
Photoelectron Spectrum ◽  
Hydrogen Isocyanide ◽  
First Time

The photoelectron spectrum of the X1Σ+ → X+2Σ+ ionizing transition of hydrogen isocyanide (HNC) is measured for the first time at a fixed photon energy (13 eV).

scholarly journals Нерезонансное обращение волнового фронта света на поверхности пленок GaN при большой мощности оптического возбуждения

2019 ◽  
Vol 53 (1) ◽  
pp. 26
Author(s):  
А.Н. Грузинцев ◽  
А.Н. Редькин
Keyword(s):  
Photon Energy ◽  
Signal Intensity ◽  
Room Temperature ◽  
Phase Conjugation ◽  
Charge Carriers ◽  
Nitrogen Laser ◽  
Free Charge ◽  
Laser Pumping ◽  
Infrared Spectral ◽  
First Time

AbstractThe possibility of the nonresonance phase conjugation of light in an excited semiconductor medium is shown theoretically and experimentally. In epitaxial GaN films pumped with a nitrogen laser at room temperature, the induced phase conjugation of light in the visible and infrared spectral regions is detected for the first time. The dependences of the phase-conjugation signal intensity on the photon energy and laser-pumping intensity are studied. An interpretation of the effect as a result of the absorption and refraction of light at laser-induced free charge carriers in the semiconductor medium is proposed.

Photoacoustic Study of The Effect of 0.9 eV Light Illumination in Semi-Insulating GaAs

1997 ◽  
Vol 484 ◽  
Author(s):  
Atsuhiko Fukuyama ◽  
Yoshito Akashi ◽  
Kenji Yoshino ◽  
Kouji Maeda ◽  
Tetsuo Ikari
Keyword(s):  
Optical Absorption ◽  
Photon Energy ◽  
Metastable State ◽  
Energy Region ◽  
Broad Peak ◽  
Light Illumination ◽  
Transformation Rates ◽  
The Difference ◽  
First Time ◽  
Absorption Measurements

AbstractThe effect of the secondary light illumination of hv = 0.9 eV on the photoquenched and the enhanced states in semi-insulating GaAs are investigated by using piezoelectric photoacoustic (PPA) measurements at 80 K. It is found that the secondary light causes an optical recovery from EL2* to EL2° and this is in agrezment with the result reported by using infrared optical absorption measurements. We observed a broad peak around 0.9 eV after the secondary light illumination for the first time. The most important finding is that the PPA spectra after the secondary light illumination on the quenched and the enhanced states are the same in the whole photon energy region. We concluded that the secondary light of hv = 0.9 eV induces both an optical recovery and generation of metastable state of the EL6 level. The difference of the transformation rates of these two processes explains well the observed complex natures of the PPA signal under the secondary light illumination.

scholarly journals KSΛ PHOTOPRODUCTION ON THE NEUTRON WITHIN THE RESONANCE REGION

2014 ◽  
Vol 26 ◽  
pp. 1460100
Author(s):  
◽  
CHARLES TAYLOR ◽  
PHILIP COLE
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Photon Energy ◽  
Differential Cross ◽  
Center Of Mass ◽  
Resonance Region ◽  
Reaction Threshold ◽  
Circularly Polarized ◽  
Large Acceptance ◽  
First Time

We report some preliminary differential cross section results for the γ d → KSΛ(p) reaction using a circularly-polarized photon beam and an unpolarized LD2 target. The data was collected at the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. For this study the photon energy ranged from 1.3 to 2.53 GeV, which covers from the reaction threshold through the nucleon resonance regimes. The acceptance- and flux-corrected yields show peaks at the center-of mass energies W = 1.7 and W = 1.9 GeV. These first-time results will aid in unraveling the spectrum of non-strange excited baryons.

Photon energy dependence of satelite line intensity in the photoelectron spectrum of acetylene

1980 ◽  
Vol 70 (1) ◽  
pp. 36-40 ◽  
Author(s):  
A.M. Bradshaw ◽  
W. Eberhardt ◽  
H.J. Levinson ◽  
W. Domcke ◽  
L.S. Cederbaum
Keyword(s):  
Energy Dependence ◽  
Photon Energy ◽  
Line Intensity ◽  
Photoelectron Spectrum

Vacuum ultraviolet photoionization and dissociative photoionization of toluene: Experimental and theoretical insights

2021 ◽  
pp. 146906672110427
Author(s):  
Yujie Zhao ◽  
Pei Huang ◽  
Li Li ◽  
Yousheng Zhan ◽  
Ke Wang ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Ultraviolet Light ◽  
Photon Energy ◽  
Vacuum Ultraviolet ◽  
Theoretical Calculations ◽  
Transition States ◽  
Ionization Energies ◽  
Dissociative Photoionization ◽  
First Time ◽  
Theoretical Results

The photoionization and dissociative photoionization of toluene have been studied using synchrotron radiation vacuum ultraviolet light with photon energy in the range of 8.50–25.50 eV. The ionization energies (8.82 eV) and double ionization energies (23.80 eV) of toluene as well as the appearance energies for its major fragments C7H7+ (11.17/10.71 eV), C6H5+ (13.73 eV), C5H6+ (13.58/12.50 eV), C5H5+ (16.23 eV), C4H5+ (15.64 eV), C4H4+ (16.10 eV) and C4H3+ (17.11 eV) are determined, respectively by using photoionization efficiency spectrometry. With the help of experimental and theoretical results, seven dissociative photoionization channels have been proposed: C7H7+ + H, C6H5+ + CH3, C5H6+ + C2H2, C5H5+ + C2H2 + H, C4H5+ + C3H3, C4H4+ + C3H4 and C4H3+ + C3H4 + H. In addition, the geometries of the intermediates, transition states and products involved in these photoionization and dissociative photoionization processes have been performed at the B3LYP/6-311++G(d, p) level. The mechanisms of dissociative photoionization of toluene and the intermediates and transition states involved are discussed in detail. Generally speaking, the experimental results are in agreement with theoretical calculations in this work and published literature results. Especially the mechanisms of dissociative photoionization to C4H5+, C4H4+ and C4H3+ were discussed for the first time in this work. This investigation may provide useful information on understanding the photoionization and dissociative photoionization of toluene.

scholarly journals Radiosensitization by Gold Nanoparticles: Impact of the Size, Dose Rate, and Photon Energy

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 952 ◽  
Author(s):  
Kirill V. Morozov ◽  
Maria A. Kolyvanova ◽  
Maria E. Kartseva ◽  
Elena M. Shishmakova ◽  
Olga V. Dement’eva ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Dose Rate ◽  
Photon Energy ◽  
Fold Increase ◽  
X Rays ◽  
X Ray ◽  
Complex Dependence ◽  
Pbr322 Plasmid ◽  
First Time ◽  
Selection Of

Gold nanoparticles (GNPs) emerged as promising antitumor radiosensitizers. However, the complex dependence of GNPs radiosensitization on the irradiation conditions remains unclear. In the present study, we investigated the impacts of the dose rate and photon energy on damage of the pBR322 plasmid DNA exposed to X-rays in the presence of 12 nm, 15 nm, 21 nm, and 26 nm GNPs. The greatest radiosensitization was observed for 26 nm GNPs. The sensitizer enhancement ratio (SER) 2.74 ± 0.61 was observed at 200 kVp with 2.4 mg/mL GNPs. Reduction of X-ray tube voltage to 150 and 100 kVp led to a smaller effect. We demonstrate for the first time that the change of the dose rate differentially influences on radiosensitization by GNPs of various sizes. For 12 nm, an increase in the dose rate from 0.2 to 2.1 Gy/min led to a ~1.13-fold increase in radiosensitization. No differences in the effect of 15 nm GNPs was found within the 0.85–2.1 Gy/min range. For 21 nm and 26 nm GNPs, an enhanced radiosensitization was observed along with the decreased dose rate from 2.1 to 0.2 Gy/min. Thus, GNPs are an effective tool for increasing the efficacy of orthovoltage X-ray exposure. However, careful selection of irradiation conditions is a key prerequisite for optimal radiosensitization efficacy.

Threshold ionization and dissociation of t-butylamine

2010 ◽  
Vol 88 (2) ◽  
pp. 142-149 ◽  
Author(s):  
Paul M. Mayer ◽  
Martyn F. Guest ◽  
Emma E. Rennie ◽  
Louise Cooper ◽  
Larisa G. Shpinkova ◽  
...  
Keyword(s):  
Triplet State ◽  
Photoelectron Spectrum ◽  
Appearance Energy ◽  
Ionization Energies ◽  
Methyl Group ◽  
Fragment Ions ◽  
A Value ◽  
Coincidence Spectra ◽  
First Time ◽  
Vertical Ionization Energies

The threshold photoelectron spectrum of t-butylamine, recorded between 8 and 28 eV, is reported for the first time. The spectrum was compared to orbital ionization energies calculated at the OVGF/cc-pVTZ level of theory. The adiabatic and vertical ionization energies of the outermost orbital (made up primarily of the nitrogen p orbital) are 8.48 ± 0.02 and 9.40 ± 0.02 eV, respectively. Threshold photoelectron photoion coincidence spectra were recorded between 8.5 and 35 eV, and appearance energies for 15 fragment ions were obtained. The lowest energy dissociation is the loss of a methyl group to form the (CH3)2CNH2+ ion. RRKM fitting of this dissociation leads to a ΔfH298 for (CH3)2CNH2+ of 603 ± 3 kJ mol–1. This value is ~10 kJ mol–1 higher than the previously derived value of Lossing et al. (based on an electron ionization appearance energy value) and the G3B3 estimate. Together with the proton affinity value of 932.3 kJ mol–1, the present ΔfH298 leads to a ΔfH298 for 2-propanimine (CH3)2C=NH of 5.3 kJ mol–1, which can be compared to a value of –5.7 kJ mol–1 (based on the Lossing et al. (CH3)2CNH2+ ΔfH298) and a G3B3 value of –0.3 kJ mol–1. At photon energies above 26 eV, there is evidence for the dissociative double ionization of t-butylamine forming either the singlet or triplet state of the dication.

The photoelectron spectrum of water in the 30 to 140 eV photon energy range

1986 ◽  
Vol 84 (9) ◽  
pp. 4739-4744 ◽  
Author(s):  
M. S. Banna ◽  
B. H. McQuaide ◽  
R. Malutzki ◽  
V. Schmidt
Keyword(s):  
Energy Range ◽  
Photon Energy ◽  
Photoelectron Spectrum ◽  
Photon Energy Range

Assignment of the Low Energy Photoelectron Spectrum of the Octa-Sulphur Molecule: An ab initio Configuration Interaction Study

1983 ◽  
Vol 38 (12) ◽  
pp. 1359-1361 ◽  
Author(s):  
Michael H. Palmer
Keyword(s):  
Ab Initio ◽  
Configuration Interaction ◽  
Photoelectron Spectrum ◽  
Low Energy ◽  
Basis Set ◽  
Interaction Study ◽  
Orbital Ordering ◽  
Ionisation Potential ◽  
Koopmans Theorem ◽  
First Time

Abstract A large basis set ab initio configuration interaction study of S 8 has yielded a satisfactory assignment of the first 5 IP's of the UV-photoelectron spectrum for the first time. The ionisation potential order (low to high) is 2A1, 2E3, 2E2, 2E1 ≪2B2 and follows the orbital ordering of our recent large basis spd calculation, via the application of Koopmans' theorem.

RESONANT AUGER SPECTRA OF Kr NEAR THE L3 THRESHOLD

2002 ◽  
Vol 09 (01) ◽  
pp. 85-88 ◽  
Author(s):  
T. IBUKI ◽  
K. OKADA ◽  
K. KAMIMORI ◽  
J. SASAKI ◽  
H. YOSHIDA ◽  
...  
Keyword(s):  
Photon Energy ◽  
Energy Region ◽  
Auger Electron ◽  
Electron Spectra ◽  
Auger Spectra ◽  
Resonant Transitions ◽  
First Time ◽  
Auger Electron Spectra

Auger electron spectra were studied by scanning the photon energy near the L 3 threshold of krypton. Two resonant transitions were observed in the photon energy region 1673–1678 eV for the first time. They were identified to be the resonant 3d -2 5s and 3d -2 4d states originating in the 2p 3/2-1 5s and 2p 3/2-1 4d excitations, respectively.

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