An extreme ultraviolet spectrometer working at 10 – 130 Å for tungsten spectra observation with high spectral resolution and fast-time response in Experimental Advanced Superconducting Tokamak

2021 ◽  
pp. 165545
Author(s):  
Zong Xu ◽  
Ling Zhang ◽  
Yunxin Cheng ◽  
Shigeru Morita ◽  
Lei Li ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
Time Response ◽  
High Spectral Resolution ◽  
Fast Time ◽  
Ultraviolet Spectrometer ◽  
Superconducting Tokamak

Phase-locked, time-delayed, harmonic pulses for high spectral resolution in the extreme ultraviolet: errata

2001 ◽  
Vol 26 (21) ◽  
pp. 1729
Author(s):  
M. Bellini ◽  
S. Cavalieri ◽  
C. Corsi ◽  
M. Materazzi
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
High Spectral Resolution

scholarly journals ORFEUS observation of the central star of NGC 6543

1997 ◽  
Vol 180 ◽  
pp. 136-136
Author(s):  
J. Zweigle ◽  
M. Grewing ◽  
J. Barnstedt ◽  
M. Gölz ◽  
W. Gringel ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Planetary Nebula ◽  
Extreme Ultraviolet ◽  
Wavelength Region ◽  
Central Star ◽  
University Of California ◽  
Satellite Mission ◽  
Ultraviolet Spectrometer ◽  
Far Ultraviolet ◽  
The University

During the ORFEUS-SPAS (Orbiting Retrievable Far and Extreme Ultraviolet Spectrometer on the Shuttle Pallet Satellite) mission STS-51, flown in September 1993, we observed the central star of the planetary nebula NGC 6543 in the far ultraviolet (90 nm to 115 nm) wavelength region using the University of California, Berkeley spectrometer with a spectral resolution of 0.03 nm.

A high-efficiency and high-spectral-resolution EUV/soft X-ray monochromator based on off-plane diffraction

2020 ◽  
Vol 27 (1) ◽  
pp. 25-30 ◽  
Author(s):  
Werner Jark
Keyword(s):  
Spectral Resolution ◽  
High Efficiency ◽  
Extreme Ultraviolet ◽  
Incident Beam ◽  
Grazing Incidence ◽  
Incident Radiation ◽  
High Spectral Resolution ◽  
X Ray ◽  
Grating Monochromator ◽  
Plane Diffraction

The most efficient diffraction at a periodic grating structure is expected to take place when the incident radiation can be considered to have been specularly reflected off the inclined part of grooves that are positioned parallel to the trajectory of the incident beam. Very encouraging results for this configuration, in which the diffraction takes place off-plane, have been reported recently for a grating to be used in a spectrometer for space science investigations. This grating provided high efficiency for a relatively large groove density and a large blaze angle. High efficiency was observed even in higher diffraction orders up to the fourth order. Here the performance parameters, especially for the combination of diffraction efficiency and achievable spectral resolution, will be discussed for a grating used in a grazing-incidence plane-grating monochromator for monochromatization of synchrotron radiation in the extreme ultraviolet (EUV) and soft X-ray range with photon energies between 30 eV and 2000 eV. It is found that the instrument can provide competitive spectral resolution in comparison with the use of in-plane diffraction. In the case of comparable spectral resolution, the off-plane diffraction is found to provide superior efficiency.

On obtaining high spectral resolution in extreme ultraviolet/soft X-ray monochromators operating off-plane diffraction in a divergent incident beam

2020 ◽  
Vol 27 (6) ◽  
pp. 1499-1509
Author(s):  
Werner Jark
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
Specular Reflection ◽  
Incident Beam ◽  
Diffraction Order ◽  
Source Size ◽  
Resolving Power ◽  
High Spectral Resolution ◽  
Radiation Beam ◽  
X Ray

When the trajectory of an incident beam is oriented parallel to the grooves of a periodic grating structure the radiation beam is diffracted off-plane orthogonal to the plane of incidence. The diffraction efficiency in this condition is very high and in a grating with a sawtooth profile it can approach the reflection coefficient for a simple mirror, when the diffraction order of interest follows the direction for specular reflection at the flat part of the steps. When this concept is used in a plane grating in a monochromator for synchrotron radiation sources, the incident beam is almost always collimated in order to minimize any deterioration of the beam properties due to aberrations, which will be introduced in the diffraction process when an uncollimated beam is used. These aberrations are very severe when the groove density is constant. It will be shown that the effect of these aberrations can be corrected after the diffraction by the use of astigmatic focusing. The latter can be provided by a crossed mirror pair with different focal lengths in the corresponding orthogonal directions. Then a monochromator based on this concept can provide source size limited spectral resolution in an uncollimated incident beam. This is identical to the spectral resolution that can be provided by the same grating when operated at the same position in a collimated incident beam. The source size limited spectral resolution in this case corresponds to a high spectral resolving power of better than ΔE/E = 10 000 for photon energies around 300 eV in the soft X-ray range.

Phase-locked, time-delayed harmonic pulses for high spectral resolution in the extreme ultraviolet

2001 ◽  
Vol 26 (13) ◽  
pp. 1010 ◽  
Author(s):  
M. Bellini ◽  
S. Cavalieri ◽  
C. Corsi ◽  
M. Materazzi
Keyword(s):  
Spectral Resolution ◽  
Extreme Ultraviolet ◽  
High Spectral Resolution

Nanosecond Time-Resolved Step-Scan FT-IR Spectroscopy in Conventional and Supercritical Fluids Using a Four-Window Infrared Cell

2002 ◽  
Vol 56 (1) ◽  
pp. 31-39 ◽  
Author(s):  
Xue Z. Sun ◽  
Sergei M. Nikiforov ◽  
Jixin Yang ◽  
Christopher S. Colley ◽  
Michael W. George
Keyword(s):  
Supercritical Fluids ◽  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Fast Time ◽  
Transient Time ◽  
Kinetic Measurements ◽  
Time Resolved ◽  
Significant Difference ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Fast time-resolved step-scan FT-IR (s2–FT-IR) has been used to study excited states and reaction intermediates in conventional and supercritical solvents. We have developed a four-port IR cell for s2–FT-IR measurements. The generation of W(CO)5(Xe), following photolysis of W(CO)6 in supercritical Xe, has been used to optimize our s2–FT-IR measurements in supercritical fluids using the four-port IR cell. We have compared a number of different approaches for obtaining transient time-resolved IR (TR-IR) data. The IR diode-laser-based and s2–FT-IR approaches for TR-IR have been compared directly. The kinetic decay of the CpMo(CO)3 (Cp = η5–C5H5) radical in supercritical CO2 has been determined using both TR-IR approaches, and we find no significant difference in signal-to-noise between these techniques for most of our TR-IR kinetic measurements. We have attempted to compare s2–FT-IR to the scanning dispersive TR-IR method by obtaining the infrared spectrum of the triplet excited state of 4-phenylbenzophenone, which has been published previously. The importance of obtaining high spectral resolution s2–FT-IR spectra for reactions in condensed phases is investigated. The IR spectrum of the CpFe(CO)2 radical in n-heptane shows that important information regarding the structure of the radical can only be obtained by performing time-resolved s2–FT-IR experiments at high spectral resolution.

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