Direct spectral evidence of single-axis rotation and ortho-hydrogen-assisted nuclear spin conversion of CH3F in solid para-hydrogen

2008 ◽  
Vol 129 (10) ◽  
pp. 104502 ◽  
Author(s):  
Yuan-Pern Lee ◽  
Yu-Jong Wu ◽  
Jon T. Hougen
Keyword(s):  
Nuclear Spin ◽  
Para Hydrogen ◽  
Spin Conversion ◽  
Ortho Hydrogen ◽  
Spectral Evidence ◽  
Axis Rotation ◽  
Single Axis Rotation

Internal Rotation and Spin Conversion of CH3OH in Solid para-Hydrogen

Science ◽  
2006 ◽  
Vol 311 (5759) ◽  
pp. 365-368 ◽  
Author(s):  
Yuan-Pern Lee ◽  
Yu-Jong Wu ◽  
R. M. Lees ◽  
Li-Hong Xu ◽  
Jon T. Hougen
Keyword(s):  
Internal Rotation ◽  
Nuclear Spin ◽  
Spin Symmetry ◽  
Spectral Lines ◽  
High Resolution Spectrum ◽  
Para Hydrogen ◽  
Spin Conversion ◽  
Host Matrix ◽  
Matrix Isolation Spectroscopy ◽  
Insight Into

The quantum solid para-hydrogen (p-H2) has recently proven useful in matrix isolation spectroscopy. Spectral lines of compounds embedded in this host are unusually narrow, and several species have been reported to rotate in p-H2. We found that a p-H2 matrix inhibits rotation of isolated methanol (CH3OH) but still allows internal rotation about the C–O bond, with splittings of the E/A torsional doublet in internal rotation–coupled vibrational modes that are qualitatively consistent with those for CH3OH in the gaseous phase. This simplified high-resolution spectrum further revealed the slow conversion of nuclear spin symmetry from species E to species A in the host matrix, offering potential insight into nuclear spin conversion in astrophysical sources.

scholarly journals A Low-Cost MEMS Missile-Borne Compound Rotation Modulation Scheme

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4910
Author(s):  
Xiaoqiao Yuan ◽  
Jie Li ◽  
Xi Zhang ◽  
Kaiqiang Feng ◽  
Xiaokai Wei ◽  
...  
Keyword(s):  
Rotation Axis ◽  
Low Cost ◽  
Roll Angle ◽  
Modulation Scheme ◽  
Navigation Systems ◽  
Rotation Scheme ◽  
Compound Rotation ◽  
Error Accumulation ◽  
Axis Rotation ◽  
Single Axis Rotation

Rotation modulation (RM) has been widely used in navigation systems to significantly improve the navigation accuracy of inertial navigation systems (INSs). However, the traditional single-axis rotation modulation cannot achieve the modulation of all the constant errors in the three directions; thus, it is not suitable for application in highly dynamic environments due to requirements for high precision in missiles. Aiming at the problems of error accumulation and divergence in the direction of rotation axis existing in the traditional single-axis rotation modulation, a novel rotation scheme is proposed. Firstly, the error propagation principle of the new rotation modulation scheme is analyzed. Secondly, the condition of realizing the error modulation with constant error is discussed. Finally, the original rotation modulation navigation algorithm is optimized for the new rotation modulation scheme. The experiment and simulation results show that the new rotation scheme can effectively modulate the error divergence of roll angle and improve the accuracy of roll angle by two orders of magnitude.

VUV photochemistry and nuclear spin conversion of water and water–orthohydrogen complexes in parahydrogen crystals at 4 K

2021 ◽  
Vol 23 (7) ◽  
pp. 4094-4106
Author(s):  
Fatemeh S. Tahsildaran F ◽  
Brendan Moore ◽  
Termeh Bashiri ◽  
Hatsuki Otani ◽  
Pavle Djuricanin ◽  
...  
Keyword(s):  
Nuclear Spin ◽  
Quantum Tunneling ◽  
Oh Radicals ◽  
Spin Conversion

VUV irradiation of water in solid pH2 yields OH radicals which subsequently react with surrounding H2 rapidly via quantum tunneling.

Nuclear spin conversion of molecular hydrogen on amorphous solid water in the presence of O2traces

2011 ◽  
Vol 13 (6) ◽  
pp. 2172-2178 ◽  
Author(s):  
M. Chehrouri ◽  
J.-H. Fillion ◽  
H. Chaabouni ◽  
H. Mokrane ◽  
E. Congiu ◽  
...  
Keyword(s):  
Nuclear Spin ◽  
Molecular Hydrogen ◽  
Amorphous Solid ◽  
Spin Conversion ◽  
Amorphous Solid Water ◽  
Solid Water

Experimental determination of spin-rotation and spin-spin magnetic interactions in by nuclear spin conversion

2003 ◽  
Vol 22 (2) ◽  
pp. 199-207 ◽  
Author(s):  
P. Cacciani ◽  
J. Cosléou ◽  
F. Herlemont ◽  
M. Khelkhal ◽  
J. Legrand
Keyword(s):  
Experimental Determination ◽  
Nuclear Spin ◽  
Spin Rotation ◽  
Magnetic Interactions ◽  
Spin Conversion
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