scholarly journals Simultaneous Observation of Tungsten Spectra of W0 to W46+ Ions in Visible, VUV and EUV Wavelength Ranges in the Large Helical Device

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 69
Author(s):  
Tetsutarou Oishi ◽  
Shigeru Morita ◽  
Daiji Kato ◽  
Izumi Murakami ◽  
Hiroyuki A. Sakaue ◽  
...  
Keyword(s):  
Vacuum Ultraviolet ◽  
Extreme Ultraviolet ◽  
Spectroscopic Studies ◽  
Comprehensive Understanding ◽  
Simultaneous Observation ◽  
Experimental Database ◽  
Carbon Tube ◽  
Single Discharge ◽  
Future Task ◽  
Tungsten Metal

Spectroscopic studies for emissions released from tungsten ions have been conducted in the Large Helical Device (LHD) for contribution to the tungsten transport study in tungsten divertor fusion devices and for expansion of the experimental database of tungsten line emissions. Tungsten ions are distributed in the LHD plasma by injecting a pellet consisting of a small piece of tungsten metal wire enclosed by a carbon tube. Line emissions from W0, W5+, W6+, W24+–W28+, W37+, W38+, and W41+–W46+ are observed simultaneously in the visible (3200–3550 Å), vacuum ultraviolet (250–1050 Å), and extreme ultraviolet (5–300 Å) wavelength ranges and the wavelengths are summarized. Temporal evolutions of line emissions from these charge states are compared for comprehensive understanding of tungsten impurity behavior in a single discharge. The charge distribution of tungsten ions strongly depends on the electron temperature. Measurements of emissions from W10+ to W20+ are still insufficient, which is addressed as a future task.

Nitrogen-Vacancy Centers in Diamond for High-Performance Detection of Vacuum Ultraviolet, Extreme Ultraviolet, and X-rays

2019 ◽  
Vol 12 (3) ◽  
pp. 3847-3853
Author(s):  
Hsiao-Chi Lu ◽  
Jen-Iu Lo ◽  
Yu-Chain Peng ◽  
Sheng-Lung Chou ◽  
Bing-Ming Cheng ◽  
...  
Keyword(s):  
High Performance ◽  
Vacuum Ultraviolet ◽  
Extreme Ultraviolet ◽  
Nitrogen Vacancy ◽  
X Rays ◽  
Nitrogen Vacancy Centers

Photoluminescence of diamond containing nitrogen vacancy defects as a sensor of temperature upon exposure to vacuum- and extreme-ultraviolet radiation

2020 ◽  
Vol 22 (46) ◽  
pp. 26982-26986
Author(s):  
Hsiao-Chi Lu ◽  
Jen-Iu Lo ◽  
Yu-Chain Peng ◽  
Bing-Ming Cheng
Keyword(s):  
Ultraviolet Radiation ◽  
Vacuum Ultraviolet ◽  
Extreme Ultraviolet ◽  
Wavelength Region ◽  
Nitrogen Vacancy ◽  
Vacancy Defects ◽  
Extreme Ultraviolet Radiation ◽  
Nitrogen Vacancies

Upon excitation with vacuum-ultraviolet (VUV) and extreme-ultraviolet (EUV) radiation, diamond with nitrogen vacancies (DNV) emits strong photoluminescence (PL) in the wavelength region of 550–800 nm.

High Temperature Furnace System for Vacuum Ultraviolet Spectroscopic Studies

1973 ◽  
Vol 12 (8) ◽  
pp. 1858 ◽  
Author(s):  
C. M. Brown ◽  
R. H. Naber ◽  
S. G. Tilford ◽  
M. L. Ginter
Keyword(s):  
High Temperature ◽  
Vacuum Ultraviolet ◽  
Spectroscopic Studies ◽  
High Temperature Furnace ◽  
Temperature Furnace

scholarly journals Photodissociation branching ratios of 13C16O and 12C18O in the vacuum ultraviolet region from 107 800 to 109 700 cm−1

2020 ◽  
Vol 637 ◽  
pp. A37 ◽  
Author(s):  
Xiaoping Chi ◽  
Pan Jiang ◽  
Qihe Zhu ◽  
Min Cheng ◽  
Hong Gao
Keyword(s):  
Vacuum Ultraviolet ◽  
Isotope Effects ◽  
Branching Ratio ◽  
Branching Ratios ◽  
Spectroscopic Studies ◽  
Ultraviolet Region ◽  
Velocity Map Imaging ◽  
Absorption Bands ◽  
Two Photon ◽  
O Isotope

In this study, we present C+ ion photofragment spectroscopic studies and photodissociation branching ratio measurements for two CO isotopologs, 13C16O and 12C18O, in the vacuum ultraviolet (VUV) region from 107 800 cm−1 (92.76 nm) to 109 700 cm−1 (91.16 nm) using a time-slice velocity-map imaging setup and a tunable VUV laser radiation source generated by the two-photon resonance-enhanced four-wave mixing technique. Several absorption bands of 12C16O in the above energy region are reinvestigated up to higher rotational levels compared with previous studies. The results are compared among 12C16O, 13C16O, and 12C18O on a state-by-state basis, and the photodissociation branching ratios for channels C(1D) + O(3P), and C(3P) + O(1D) are dramatically changed for most of the absorption bands due to the substitutions of 12C by 13C and 16O by 18O. The branching ratios of 13C16O and 12C18O are close to each other due to their similar reduced masses. The strong and selective isotope effects obtained here not only provide useful information for understanding the complicated predissociation dynamics of CO, but are also important for developing a comprehensive photochemical model for explaining the C and O isotope heterogeneities as observed in the Solar System.

scholarly journals Vacuum Ultraviolet Absorption of Dense Plasmas with Resonance Series of Be, B, C, N, Mg, Al and Si

1972 ◽  
Vol 14 ◽  
pp. 531-531
Author(s):  
G. Mehlman-Balloffet ◽  
J. M. Esteva
Keyword(s):  
Vacuum Ultraviolet ◽  
Extreme Ultraviolet ◽  
Light Element ◽  
Numerical Data ◽  
Normal Incidence ◽  
Electron Excitation ◽  
Rydberg Series ◽  
Dense Plasmas ◽  
Continuous Background ◽  
Ionization Limit

AbstractAbsorption spectra of light elements were observed in the vacuum ultraviolet with an original technique described in an earlier paper (Mehlman-Balloffet and Esteva, 1969). The method utilizes a two-vacuum spark mounting: one of the sparks is emitting the continuous background, the other one generates the absorbing plasma. Several light element have been successsively introduced in the spark anode. For all of them new autoionizing levels have been observed in Rydberg series of resonances exhibiting the asymmetric ‘Beutler-Fano’ profile.In the beryllium and magnesium spectra three new series corresponding to two-electron excitation process have been identified while for boron, carbon, nitrogen, aluminium and silicon the resonances observed correspond to single subshell electron excitation such as: 2s22p2P0 → 2s2p(3P0)np2De for the case of boron.All these series lie in the photoionization continuum of the absorbing atomic species and usually between the first and second ionization limit. This means that they were observed with a normal incidence grating spectrograph in the spectral range 500–1500 Å. In the extreme ultraviolet some other transitions involving inner-shell electron excitation were observed. In the beryllium spectra a series lying between 100 and 110 Å was identified while, the magnesium spectra exhibited only isolated resonances in the 220-265 Å range together with an inner-shell 2p electron photoioniation continuum.A complete description of experimental results with numerical data is being submitted for publication (Esteva and Mehlman-Balloffet, 1972).

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