scholarly journals Attachment of Electrons to Molecules at meV Resolution

1992 ◽  
Vol 45 (3) ◽  
pp. 263 ◽  
Author(s):  
D Klar ◽  
M-W Ruf ◽  
H Hotop
Keyword(s):  
Energy Range ◽  
Energy Resolution ◽  
Electron Attachment ◽  
Effective Energy ◽  
Near Threshold

A selective discussion of electron attachment to molecules is presented with emphasis on recent studies of SF6, carried out with a novel laser photoelectron attachment (LPA) method in the energy range 0�1-170 me V with an effective energy resolution around 0�1 me V near threshold.

Design of an ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline

2013 ◽  
Vol 21 (1) ◽  
pp. 273-279 ◽  
Author(s):  
L. Xue ◽  
R. Reininger ◽  
Y.-Q. Wu ◽  
Y. Zou ◽  
Z.-M. Xu ◽  
...  
Keyword(s):  
Energy Range ◽  
Energy Resolution ◽  
Wide Energy Range ◽  
Ultrahigh Energy ◽  
Exit Slit ◽  
Shanghai Synchrotron Radiation Facility ◽  
X Ray ◽  
Variable Line ◽  
Line Spacing ◽  
Wide Energy

A new ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline has been designed and is under construction at the Shanghai Synchrotron Radiation Facility. The beamline has two branches: one dedicated to angle-resolved photoemission spectroscopy (ARPES) and the other to photoelectron emission microscopy (PEEM). The two branches share the same plane-grating monochromator, which is equipped with four variable-line-spacing gratings and covers the 20–2000 eV energy range. Two elliptically polarized undulators are employed to provide photons with variable polarization, linear in every inclination and circular. The expected energy resolution is approximately 10 meV at 1000 eV with a flux of more than 3 × 1010 photons s−1at the ARPES sample positions. The refocusing of both branches is based on Kirkpatrick–Baez pairs. The expected spot sizes when using a 10 µm exit slit are 15 µm × 5 µm (horizontal × vertical FWHM) at the ARPES station and 10 µm × 5 µm (horizontal × vertical FWHM) at the PEEM station. The use of plane optical elements upstream of the exit slit, a variable-line-spacing grating and a pre-mirror in the monochromator that allows the influence of the thermal deformation to be eliminated are essential for achieving the ultrahigh-energy resolution.

scholarly journals Techniques for improving the sensitivity of proportional counters used in X-ray astronomy

1970 ◽  
Vol 37 ◽  
pp. 35-40 ◽  
Author(s):  
P. W. Sanford ◽  
A. M. Cruise ◽  
J. L. Culhane
Keyword(s):  
Energy Range ◽  
Energy Resolution ◽  
X Ray ◽  
Large Window ◽  
Proportional Counters

The discovery and measurement of cosmic X-ray sources has almost invariably been performed with proportional counters which have large window areas. In the energy range from 1 to 50 keV, proportional counters have advantages over other types of detectors; they provide energy resolution and they can be made relatively easily with very large window areas.

X-Ray Spectrometric Properties of Potassium Acid Phthalate Crystals

1969 ◽  
Vol 13 ◽  
pp. 373-381 ◽  
Author(s):  
R. J. Liefeld ◽  
S. Hanzgly ◽  
T. B. Kirby ◽  
D. Mott
Keyword(s):  
Oxygen Atom ◽  
Energy Range ◽  
Energy Resolution ◽  
Reflection Coefficients ◽  
X Ray ◽  
First Order ◽  
Coefficient Of Reflection ◽  
Potassium Acid Phthalate ◽  
Order Parallel ◽  
Acid Phthalate

The results of two crystal measurements of potassium acid phthalate crystal first order parallel position rocking curves, percent reflections, and reflection coefficients are presented. They cover the 4-24 Ǻ wavelength range and are typical of results with cleaved crystals illuminated over areas of one-half to two square inches. The energy resolution available with these crystals is shown to be nearly constant at about two-thirds of an electron volt over most of the energy range studied and the coefficient of reflection is also nearly constant at about 1 x 10-4 radians. A pronounced line-like reflectivity structure at 23.3 Ǻ is exhibited which is probably associated with oxygen atom K-shell absorption.

Compton ionization of hydrogen atom near threshold by photons in the energy range of a few keV: nonrelativistic approach

2020 ◽  
Vol 74 (4) ◽  
Author(s):  
Salim Houamer ◽  
Ochbadrakh Chuluunbaatar ◽  
Igor P. Volobuev ◽  
Yuri V. Popov
Keyword(s):  
Hydrogen Atom ◽  
Energy Range ◽  
Near Threshold

ELECTRON ATTACHMENT TO OXYGEN AND NITRIC-OXIDE CLUSTERS WITH HIGH ENERGY RESOLUTION

1999 ◽  
pp. 177-196
Author(s):  
P. SCHEIER ◽  
G. SENN ◽  
P. STAMPFLI ◽  
T. D. MÄRK ◽  
Y. CHU ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Energy Resolution ◽  
Electron Attachment ◽  
High Energy ◽  
High Energy Resolution

scholarly journals Results from the Cuore Experiment †

Universe ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 10 ◽  
Author(s):  
Alessio Caminata ◽  
Douglas Adams ◽  
Chris Alduino ◽  
Krystal Alfonso ◽  
Frank Avignone ◽  
...  
Keyword(s):  
Beta Decay ◽  
Energy Resolution ◽  
Half Life ◽  
Precise Measurement ◽  
Region Of Interest ◽  
Neutrinoless Double Beta Decay ◽  
Double Beta Decay ◽  
Effective Energy ◽  
Β Decay ◽  
Compact Structure

The Cryogenic Underground Observatory for Rare Events (CUORE) is the first bolometric experiment searching for neutrinoless double beta decay that has been able to reach the 1-ton scale. The detector consists of an array of 988 TeO 2 crystals arranged in a cylindrical compact structure of 19 towers, each of them made of 52 crystals. The construction of the experiment was completed in August 2016 and the data taking started in spring 2017 after a period of commissioning and tests. In this work we present the neutrinoless double beta decay results of CUORE from examining a total TeO 2 exposure of 86.3 kg yr , characterized by an effective energy resolution of 7.7 keV FWHM and a background in the region of interest of 0.014 counts / ( keV kg yr ) . In this physics run, CUORE placed a lower limit on the decay half-life of neutrinoless double beta decay of 130 Te > 1.3 · 10 25 yr (90% C.L.). Moreover, an analysis of the background of the experiment is presented as well as the measurement of the 130 Te 2 ν β β decay with a resulting half-life of T 1 / 2 2 ν = [ 7.9 ± 0.1 ( stat . ) ± 0.2 ( syst . ) ] × 10 20 yr which is the most precise measurement of the half-life and compatible with previous results.

A focusing X-ray telescope for use in the study of extraterrestrial X-ray sources in the energy range 20–140 keV

1968 ◽  
Vol 46 (10) ◽  
pp. S1103-S1106 ◽  
Author(s):  
T. R. Llndquist ◽  
W. R. Webber
Keyword(s):  
Energy Range ◽  
Rock Salt ◽  
Angular Resolution ◽  
X Rays ◽  
Effective Energy ◽  
Optimum Thickness ◽  
Bragg Condition ◽  
X Ray ◽  
Area Efficiency ◽  
Salt Crystals

We have designed and tested a focusing X-ray telescope with an angular resolution (FWHM) of 1.0° for the study of extraterrestrial X-ray sources in the energy range 20–140 keV. The telescope's lens is an array of rock salt crystals (each of which is approximately one inch square), mounted on a 6-ft-diameter paraboloidal frame. The lens is located 9.5 ft above a 2-in.-diameter NaI crystal and PM tube (which measures the energy of the incident X ray). X rays passing through the salt crystals undergo a 2θ deflection if the Bragg condition for reflection, nλ = 2d sin θ, is approximately satisfied. Optimum thickness and effective energy bandwidths for such reflections have been determined for energies in the telescope's operating range. The area-efficiency product of the lens is approximately 8 times the NaI crystal area from 20 to 40 keV, giving a real improvement in the signal-to-background ratio. Crystals more nearly perfect than rock salt offer the possibility of increased gain over narrow energy intervals. Polarization measurements of the incident X rays may also be made.

Electron attachment to oxygen clusters studied with high energy resolution

1999 ◽  
Vol 111 (8) ◽  
pp. 3548-3558 ◽  
Author(s):  
S. Matejcik ◽  
P. Stampfli ◽  
A. Stamatovic ◽  
P. Scheier ◽  
T. D. Märk
Keyword(s):  
Energy Resolution ◽  
Electron Attachment ◽  
High Energy ◽  
High Energy Resolution

scholarly journals Взаимодействие низкоэнергетических электронов с молекулами D-рибозы

2021 ◽  
Vol 129 (12) ◽  
pp. 1471
Author(s):  
И.В. Чернышова ◽  
Е.Э. Контрош ◽  
О.Б. Шпеник
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Electron Scattering ◽  
Cross Sections ◽  
Electron Attachment ◽  
Low Energy ◽  
Dissociative Electron Attachment ◽  
Low Energy Electrons ◽  
First Time

Abstract– The interactions of low-energy electrons (<20 eV) with D-ribose molecules, namely, electron scattering and dissociative attachment, are studied. The results of these studies showed that the fragmentation of D-ribose molecules occurs effectively even at an electron energy close to zero. as well as in the energy range 5.50–9.50 eV. In the total cross section of electron scattering by molecules, resonance features at energies of 5.00–9.00 eV in the region of formation of ionic fragments C3H4O2–, C2H3O2–, OH–, associated with the destruction of molecular heterocycles, were experimentally discovered for the first time. The correlation of the features observed in the scattering and dissociative electron attachment cross sections is analyzed.

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