scholarly journals Nuclear Spin Symmetry Conservation in 1H216O Investigated by Direct Absorption FTIR Spectroscopy of Water Vapor Cooled Down in Supersonic Expansion

2017 ◽  
Vol 121 (40) ◽  
pp. 7455-7468 ◽  
Author(s):  
Robert Georges ◽  
Xavier Michaut ◽  
Audrey Moudens ◽  
Manuel Goubet ◽  
Olivier Pirali ◽  
...  
Keyword(s):  
Water Vapor ◽  
Ftir Spectroscopy ◽  
Nuclear Spin ◽  
Spin Symmetry ◽  
Direct Absorption ◽  
Supersonic Expansion

Hydroxyl Radical Fluorescence and Quantum Yield Following Lyman-α Photoexcitation of Water Vapor in a Room Temperature Cell and Cooled in a Supersonic Expansion

2018 ◽  
Vol 122 (25) ◽  
pp. 5602-5609 ◽  
Author(s):  
Justin W. Young ◽  
Ryan S. Booth ◽  
Kristen M. Vogelhuber ◽  
Jaime A. Stearns ◽  
Christopher J. Annesley
Keyword(s):  
Water Vapor ◽  
Quantum Yield ◽  
Hydroxyl Radical ◽  
Room Temperature ◽  
Supersonic Expansion

Violation of nuclear-spin symmetry in collisions of symmetric tops

1998 ◽  
Vol 294 (4-5) ◽  
pp. 387-390 ◽  
Author(s):  
B Nagels ◽  
P Bakker ◽  
L.J.F Hermans ◽  
P.L Chapovsky
Keyword(s):  
Nuclear Spin ◽  
Spin Symmetry

Water vapor isotopologues (H216O, H218O and HD16O) by ground-based FTIR spectroscopy in central Mexico

2021 ◽  
Author(s):  
Alain Zuber ◽  
Wolfgang Stremme ◽  
Adolfo Magaldi ◽  
Michel Grutter ◽  
Caludia Rivera ◽  
...  
Keyword(s):  
Water Vapor ◽  
Ftir Spectroscopy ◽  
Hydrological Cycle ◽  
Isotopic Ratio ◽  
Dew Point ◽  
Central Mexico ◽  
Isotopic Ratios ◽  
Solar Absorption ◽  
Rain Season ◽  
The Relationship

<p><span>Knowledge about water vapor isotopologues is a useful tool in the study of the hydrological cycle. Total columns of water vapor isotopologues (H</span><sub><span>2</span></sub><sup><span>16</span></sup><span>O, H</span><sub><span>2</span></sub><sup><span>18</span></sup><span>O and HD</span><sup><span>16</span></sup><span>O) are measured by ground-based solar absorption FTIR spectroscopy at Altzomoni (3985 m.a.s.l, 19.12ºN, 98.66ºW), a high altitude subtropical remote background site in central Mexico (Barthlott et al., 2017). In the contribution we present the time series of the isotopic composition of water vapor columns and profiles above central Mexico and analyze differences in the isotopic ratios of H</span><sub><span>2</span></sub><sup><span>16</span></sup><span>O, H</span><sub><span>2</span></sub><sup><span>18</span></sup><span>O and HD</span><sup><span>16</span></sup><span>O between the rain and dry seasons of the year: in the rain season, changes in the isotopic ratios might be dominated by the diurnal cycle, which correlates with the relative humidity, temperature and dew point, while isotopic ratio in the dry season might depend more on the origin of the air parcels and transportation. We discuss the hydrological cycle in central Mexico using the relationship between light and heavy isotopes, and how this relationship gives valuable information about the pathways, sources and transport.</span></p>

On the Role of Nuclear Spin Symmetry of Symmetric Top Molecules in Gas Phase Nuclear Magnetic Relaxation

1974 ◽  
Vol 52 (5) ◽  
pp. 387-395 ◽  
Author(s):  
B. C. Sanctuary
Keyword(s):  
Nuclear Spin ◽  
Magnetic Relaxation ◽  
Spin Symmetry ◽  
Nuclear Magnetic Relaxation ◽  
The Difference ◽  
Symmetric Top Molecules ◽  
Spin Species ◽  
Zero Frequency ◽  
Nuclear Magnetic

For symmetric top molecules the role of nuclear spin symmetry is included in the derivation of the nuclear magnetic relaxation rate. It is assumed that this is dominated by a spin-rotation mechanism. Of the three nuclear spin species which exist for ZX3Y' symmetric tops, it is found that the "zero frequency" K = −1 to +1 term results in two of the species relaxing with a different rate from the third. The difference, which allows a direct NMR evaluation of the relative values of [Formula: see text] and [Formula: see text], is enhanced at low temperatures.

Nuclear-Spin-Symmetry Conversion of Tunneling Methyl Groups

1973 ◽  
Vol 31 (23) ◽  
pp. 1375-1377 ◽  
Author(s):  
S. Clough ◽  
W. S. Hinshaw ◽  
T. Hobson
Keyword(s):  
Nuclear Spin ◽  
Spin Symmetry ◽  
Methyl Groups
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