Kinetic Spectroscopic Studies of Cl(3p5 2P3/2, 1/2) in the Vacuum Ultraviolet

1969 ◽  
Vol 50 (9) ◽  
pp. 4115-4116 ◽  
Author(s):  
R. J. Donovan ◽  
D. Husain ◽  
A. M. Bass ◽  
W. Braun ◽  
D. D. Davis
Keyword(s):  
Vacuum Ultraviolet ◽  
Spectroscopic Studies

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 Six Low-Lying Isomers of C11H8 Are Unidentified in the Laboratory - a Theoretical Study

2021 ◽  
Author(s):  
Tarun Roy ◽  
Subhas Ghosal ◽  
Venkatesan Thimmakondu
Keyword(s):  
Density Functional ◽  
Vacuum Ultraviolet ◽  
Parent Compound ◽  
Spectroscopic Properties ◽  
Spectroscopic Studies ◽  
Intrinsic Reaction Coordinate ◽  
Ionization Mass ◽  
Functional Theory ◽  
Cluster Methods ◽  
Derivatives Of

The potential energy surface of C<sub>11</sub>H<sub>8</sub> has been theoretically examined using density functional theory and coupled-cluster methods. The current investigation reveals that 2aH-cyclopenta[cd]indene (<b>2</b>), 7-ethynyl-1H-indene (<b>6</b>), 4-ethynyl-1H-indene (<b>7</b>), 6-ethynyl-1H-indene(<b>8</b>), 5-ethynyl-1H-indene (<b>9</b>), and 7bH-cyclopenta[cd]indene (<b>10</b>) remain elusive to date in the laboratory. The puckered low-lying isomer <b>2</b> lies at 11 kJ mol<sup>−1</sup> below the experimentally known molecule, cyclobuta[de]naphthalene (<b>3</b>), at the fc-CCSD(T)/cc-pVTZ//fc-CCSD(T)/cc-pVDZ level of theory. <b>2</b> lies at 35 kJ mol<sup>−1</sup> above the thermodynamically most stable and experimentally known isomer, 1H-cyclopenta[cd]indene (<b>1</b>), at the same level. It is identified that 1,2-H transfer from <b>1</b> yields 2H-cyclopenta[cd]indene (<b>14</b>) and subsequent 1,2-H shift from <b>14</b> yields <b>2</b>. Appropriate transition states have been identified and intrinsic reaction coordinate calculations have been done at the B3LYP/6-311+G(d,p) level of theory. Recently, 1-ethynyl-1H-indene (<b>11</b>) has been detected using synchrotron based vacuum ultraviolet ionization mass spectrometry. 2-ethynyl-1H-indene (<b>4</b>) and 3-ethynyl-1H-indene (<b>5</b>) have been synthetically characterized in the past. While the derivatives of 7bH-cyclopenta[cd]indene (<b>10</b>) have been isolated elsewhere, the<br>parent compound remains unidentified to date in the laboratory. Although C<sub>11</sub>H<sub>8</sub> is a key elemental composition in reactive intermediates chemistry and most of its isomers are having a non-zero dipole moment, to the best of our knowledge, none of them have been characterized by rotational spectroscopy. Therefore, energetic and spectroscopic properties have been computed and the present investigation necessitates new synthetic studies on C<sub>11</sub>H<sub>8</sub>, in particular <b>2</b>, <b>6</b>-<b>10</b>, and also rotational spectroscopic studies on all low-lying isomers.

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.

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