HIGH-RESOLUTION HYPERNUCLEAR SPECTROSCOPY ELECTRON SCATTERING AT JLab, HALL A

2010 ◽  
Vol 19 (12) ◽  
pp. 2487-2496 ◽  
Author(s):  
◽  
F. Garibaldi ◽  
E. Cisbani ◽  
F. Cusanno ◽  
S. Frullani ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Resolution ◽  
Energy Resolution ◽  
Electron Scattering ◽  
Ground State ◽  
Missing Energy ◽  
High Quality ◽  
The Core ◽  
Final Data ◽  
First Time

The characteristics of the Jefferson LAB electron beam, together with those of the experimental equipments, offer a unique opportunity to study hypernuclear spectroscopy via electromagnetic induced reactions. Experiment 94-107 started a systematic study on 1p-shell targets, 12 C , 9 Be and 16 O . We present the results from 12 C , 16 O and very preliminary results from 9 Be . For 12 C for the first time measurable strength in the core-excited part of the spectrum between the ground state and the pΛ state was shown in [Formula: see text] for the first time. A high-quality 16Λ N spectrum was produced for the first time with sub-MeV Energy resolution. A very precise B Λ value for 16Λ N , calibrated against the elementary ( e , e ′ K +) reaction on hydrogen, has also been obtained. Final data on 9 Be will be available soon. The missing energy resolution is the best ever obtained in hypernuclear production experiments.

Ground state molecular parameters of phosphine, PH3, from the simultaneous analysis of the high-resolution infrared, microwave and submillimeterwave spectra

1985 ◽  
Vol 50 (11) ◽  
pp. 2480-2492 ◽  
Author(s):  
Soňa Přádná ◽  
Dušan Papoušek ◽  
Jyrki Kauppinen ◽  
Sergei P. Belov ◽  
Andrei F. Krupnov ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Ground State ◽  
Unitary Transformation ◽  
Point Of View ◽  
Acoustic Detection ◽  
Molecular Parameters ◽  
Microwave Spectrometer ◽  
Fourier Transform Spectra ◽  
First Time

Fourier transform spectra of the ν2 band of PH3 have been remeasured with 0.0045 cm-1 resolution. Ground state combination differences from these data have been fitted simultaneously with the microwave and submillimeterwave data to determine the ground state spectroscopical parameters of PH3 including the parameters of the Δk = ± 3n interactions. The correlation between the latter parameters has been discussed from the point of view of the existence of two equivalent effective rotational operators which are related by a unitary transformation. The ΔJ = 0, +1, ΔK = 0 (A1 ↔ A2, E ↔ E) rotational transitions in the ν2 and ν4 states have been measured for the first time by using a microwave spectrometer and a radiofrequency spectrometer with acoustic detection.

K-shell photoionization of Li, Be+ and B2+

2016 ◽  
Vol 30 (15) ◽  
pp. 1650204 ◽  
Author(s):  
Jun Li ◽  
Jian Dang Liu ◽  
Song Bin Zhang ◽  
Bang Jiao Ye
Keyword(s):  
High Resolution ◽  
Light Source ◽  
Cross Sections ◽  
Ground State ◽  
Matrix Method ◽  
Theoretical Calculations ◽  
Metastable States ◽  
The Core ◽  
Advanced Light Source ◽  
State Formula

K-shell photoionization (PI) of Li, Be[Formula: see text] and B[Formula: see text] from ground state [Formula: see text] have been studied by using the [Formula: see text]-matrix method with pseudostates. The K-shell PI process is featured with the contributions from the core-excited metastable states or dominated by the Auger states 2Po. The resonant parameters of the Auger states 2Po and the PI cross-sections have been calculated and compared with the available experimental and theoretical works. Our results agree very well with that of the published works. It is worth noting that compared with previous theoretical calculations, our results of B[Formula: see text] show better agreements with the latest high-resolution advanced light source measurements [A. Müller et al., J. Phys. B 43 (2010) 135602].

scholarly journals HYPERNUCLEAR SPECTROSCOPY WITH ELECTRON BEAM AT JLab HALL C

2010 ◽  
Vol 19 (12) ◽  
pp. 2480-2486 ◽  
Author(s):  
Y. Fujii ◽  
A. Chiba ◽  
D. Doi ◽  
T. Gogami ◽  
O. Hashimoto ◽  
...  
Keyword(s):  
Electron Beam ◽  
High Resolution ◽  
Energy Resolution ◽  
Charge Separation ◽  
Experimental Setup ◽  
Electron Spectrometer ◽  
The Third ◽  
Yield Rate ◽  
Resolution Electron ◽  
Better Than

Hypernuclear spectroscopy with electron beam at JLab Hall C has been studied since 2000. The first experiment, JLab E89-009, demonstrated the possibility of the (e, e′ K+) reaction for hypernuclear spectroscopy by achieving an energy resolution of better than 1 MeV (FWHM). The second experiment, JLab E01-011 employed a newly constructed high resolution kaon spectrometer and introduced a vertically tilted electron arm setup to avoid electrons from bremsstrahlung and Moeller scattering. The setup allowed us to have 10 times yield rate and 4 times better signal to accidental ratio with expected energy resolution of 400 keV (FWHM). The third experiment, JLab E05-115 will be performed in 2009 with employing newly constructed high resolution electron spectrometer and a new charge-separation magnet. With the fully customized third generation experimental setup, we can study a variety of targets up to medium-heavy ones such as 52 Cr .

scholarly journals Колебательно-вращательный анализ "горячей" полосы 2ν_2-ν-=SUB=-2-=/SUB=- молекул -=SUP=-15-=/SUP=-NH-=SUB=-2-=/SUB=-D и -=SUP=-15-=/SUP=-NHD-=SUB=-2-=/SUB=-

2020 ◽  
Vol 128 (1) ◽  
pp. 34
Author(s):  
А.Л. Фомченко ◽  
А.С. Белова ◽  
А.В. Кузнецов
Keyword(s):  
High Resolution ◽  
Initial Data ◽  
Ground State ◽  
Vibrational State ◽  
Energy Levels ◽  
The State ◽  
Energy Structure ◽  
Spectroscopic Parameters ◽  
First Time ◽  
Line Positions

The high-resolution spectra of the “hot” 2ν2-ν2 band of the 15NH2D and 15NHD2 molecules were studied for the first time. The analysis is based on the ground state combination differences method. As a result, the energy structure of the inversion-vibrational state (v2 = 2, s) was obtained for both studied molecules; more than 480 vibrational-rotational transitions of the “hot” bands were assign. The values ​​of the upper energy levels determined on the basis of the line positions were used as initial data to determine the spectroscopic parameters of the state (v2 = 2, s).

scholarly journals Новые линии в спектрах ИК люминесценции высокого разрешения монокристаллов SiC политипов 4H и 6H

2020 ◽  
Vol 128 (9) ◽  
pp. 1264
Author(s):  
К.Н. Болдырев ◽  
Д.Д. Гуценко ◽  
С.А. Климин ◽  
Н.Н. Новикова ◽  
Б.Н. Маврин ◽  
...  
Keyword(s):  
High Resolution ◽  
Low Temperature ◽  
Single Crystals ◽  
Absorption Spectra ◽  
High Energy ◽  
High Quality ◽  
High Energy Part ◽  
Infrared Luminescence ◽  
Energy Part ◽  
First Time

Low-temperature infrared luminescence and high-resolution absorption spectra of undoped high-quality SiC single crystals of hexagonal modifications 4H and 6H were investigated. Narrow lines with widths less than 0.2 cm^(-1) were detected, several of which were observed for the first time. It was found that some of the lines in the 4H and 6H modifications have a similar structure, however, the lines in SiC-4H are shifted to the high-energy part of the spectrum by ~ 180 cm^(-1). For the most intense quartet in the region of 1.3 μm, the energy scheme of the levels for both 4H and 6H modifications were constructed.

The Ground State and A2Π Excited State of Magnesium Deuteride

1975 ◽  
Vol 53 (15) ◽  
pp. 1477-1482 ◽  
Author(s):  
Walter J. Balfour ◽  
Hugh M. Cartwright
Keyword(s):  
Excited State ◽  
High Resolution ◽  
Emission Spectrum ◽  
Isotope Effect ◽  
Ground State ◽  
Visible Emission ◽  
Molecular Constants ◽  
Dissociation Energies ◽  
First Time ◽  
Π State

The visible emission spectrum of MgD has been reexamined at high resolution. Published analyses of the A2Π → X2Σ+ system have been extended and the data have been combined with observations in the B′2Σ+ → X2Σ+ system to provide information on the ground state levels ν = 3, 4, 5, and 6 for the first time. The following molecular constants (in cm−1) have been determined—for the A2Π state: ωc = 1154.75, ωcxc = 16.675, Bc = 3.2190, Dc = 9.64 × 10−5 and for the X2Σ+ state: ωc = 1077.71, ωcxc = 15.92, Bc = 3.0306, and Dc = 9.39 × 10−5. The dissociation energies in the A2Π and X2Σ+ states have been estimated to be ~ 15 500 cm−1 and ~ 11 500 cm−1 respectively. The MgH/MgD isotope effect and the Λ doubling in the A2Π state are discussed.

scholarly journals High-quality quartz single crystals for high-energy-resolution inelastic X-ray scattering analyzers

2013 ◽  
Vol 46 (4) ◽  
pp. 939-944 ◽  
Author(s):  
Marcelo Goncalves Hönnicke ◽  
Xianrong Huang ◽  
Cesar Cusatis ◽  
Chaminda Nalaka Koditwuakku ◽  
Yong Q. Cai
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Energy Resolution ◽  
High Energy ◽  
High Energy Resolution ◽  
High Quality ◽  
X Ray ◽  
X Ray Scattering ◽  
Low Energies ◽  
Ray Scattering

Spherical analyzers are well known instruments for inelastic X-ray scattering (IXS) experiments. High-resolution IXS experiments almost always use Si single crystals as monochromators and spherical analyzers. At higher energies (>20 keV) Si shows a high energy resolution (<10 meV), at an exact symmetric back-diffraction condition, since the energy resolution is given by the real part of the susceptibility or polarizability. However, at low energies (<10 keV), high energy resolution is difficult to achieve with Si. α-SiO2 (quartz) can be an option, since it offers high energy resolution at low energies. In this work, the characterization of high-quality α-SiO2 is presented. Such characterization is made by high-resolution rocking curve, topography and lattice parameter mapping in different samples from a single block. X-ray optics with α-SiO2 for IXS at lower energies (from 2.5 to 12.6 keV) with medium to high energy resolution (from 90 to 11 meV) are proposed and theoretically exploited.

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