scholarly journals Theoretical analysis of NMR shieldings in XSe and XTe (X = Si, Ge, Sn and Pb): the spin-rotation constant saga

2016 ◽  
Vol 18 (4) ◽  
pp. 3112-3123 ◽  
Author(s):  
Taye Beyene Demissie
Keyword(s):  
Theoretical Analysis ◽  
Spin Rotation ◽  
Electronic Contribution ◽  
Paramagnetic Contribution ◽  
Rotation Constant

How the electronic contribution to the spin-rotation constant is close to the paramagnetic contribution of the NMR absolute shielding constant?

Axis Switching in the Transition of HCO: Determination of Molecular Geometry

1975 ◽  
Vol 53 (19) ◽  
pp. 2232-2241 ◽  
Author(s):  
J. M. Brown ◽  
D. A. Ramsay
Keyword(s):  
Ground State ◽  
Molecular Geometry ◽  
Spin Rotation ◽  
Resolving Power ◽  
Rotational Constants ◽  
Reliable Determination ◽  
Axis Switching ◽  
Rotation Constant ◽  
Ground State Geometry

The [Formula: see text] band systems of HCO and DCO have been reinvestigated with higher resolving power than in earlier work. Some weak lines have been assigned to K′ = 0 – K″ = 0 and K′ = 0 – K″ = 2 subbands; these lines derive their intensity from axis switching. The new data give values for the A rotational constants of HCO and DCO and permit a more reliable determination of the ground state geometry, viz, r0(CH) = 1.125(5) Å, r0(CO) = 1.175(1) Å, [Formula: see text]. The sign of the spin–rotation constant εaa has been shown to be positive.

19F Nuclear Spin–Rotation Constant of Yttrium Monofluoride

1999 ◽  
Vol 198 (1) ◽  
pp. 183-185 ◽  
Author(s):  
Kaley A. Walker ◽  
Michael C.L. Gerry
Keyword(s):  
Nuclear Spin ◽  
Spin Rotation ◽  
Rotation Constant

Predissociation mechanism and spin‐rotation constant of the HCO B̃ 2A′ state

1995 ◽  
Vol 103 (1) ◽  
pp. 104-112 ◽  
Author(s):  
Shih‐Huang Lee ◽  
I‐Chia Chen
Keyword(s):  
Spin Rotation ◽  
Rotation Constant

A reexamination of the spin-rotation constant for 2Π states: The A-X band system of HCl+

1976 ◽  
Vol 61 (2) ◽  
pp. 216-230 ◽  
Author(s):  
Katherine L. Saenger ◽  
Richard N. Zare ◽  
C.Weldon Mathews
Keyword(s):  
Band System ◽  
Spin Rotation ◽  
X Band ◽  
Rotation Constant

Spin Rotation Constant and Rotational Magnetic Moment of 13C16O

1968 ◽  
Vol 49 (5) ◽  
pp. 2314-2321 ◽  
Author(s):  
Irving Ozier ◽  
Lawrence M. Crapo ◽  
Norman F. Ramsey
Keyword(s):  
Magnetic Moment ◽  
Spin Rotation ◽  
Rotation Constant

A Nuclear Spin Relaxation Study of the Spin–Rotation Interaction in Spherical Top Molecules

1972 ◽  
Vol 50 (12) ◽  
pp. 1252-1261 ◽  
Author(s):  
James A. Courtney ◽  
Robin L. Armstrong
Keyword(s):  
Lattice Relaxation ◽  
Relaxation Mechanism ◽  
Lattice Relaxation Time ◽  
Spin Rotation ◽  
Spin Lattice Relaxation ◽  
Molecular Reorientation ◽  
Effective Spin ◽  
Spin Lattice ◽  
Pass Through ◽  
Rotation Constant

The spin–lattice relaxation time T1 of the 19F nuclei was measured in gaseous samples of CF4, SiF4, GeF4, and SF6 at room temperature for densities from 0.015 to 20 amagat. In each case T1 was observed to pass through a minimum for some density less than 0.50 amagat. In addition, T1 was measured in the extreme narrowing region for SF6 at 238, 265, 293, 313, and 349.5 K.. The spin–rotation interaction provides the dominant relaxation mechanism in all cases. The data are analyzed on the basis of the assumption that the collision modulated spin–rotation interaction may be described by a single correlation function which is a simple exponential function of time. Values of an effective spin–rotation constant and a cross section for molecular reorientation are obtained for each gas. Assuming the validity of the model used to analyze the relaxation data, the combination of nuclear magnetic relaxation results with molecular beam measurements yields more accurate values of the anisotropic spin–rotation constant Cd than have been previously available.

scholarly journals Ro-inversional Spectrum of Ammonia

1996 ◽  
Vol 51 (3) ◽  
pp. 200-206 ◽  
Author(s):  
G. Winnewisser ◽  
S. P. Belov ◽  
Th. Klaus ◽  
S. Urban
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Excellent Agreement ◽  
Ground State ◽  
Spin Rotation ◽  
Center Frequency ◽  
Line Center ◽  
Astrophysical Interest ◽  
Rotation Constant ◽  
Line Center Frequency

The ground state J = 2 ←1 , K = 0 and K = 1 ro-inversional spectrum of 14NH3 and 15NH3 at 1.2 THz has been measured with an accuracy of 20 kHz using the Cologne terahertz spectrometer. The measured frequencies for the K = 0 components are:14NH3 (J, K) = a(2, 0) - s( 1,0): 1 214 852.942(20) MHz, 15NH3 (J, K) = a(2, 0 ) - s( 1,0) : 1 210 889.556(20) MHz.In addition we have determined from saturation dip measurements of the J = 1 - 0 transition the spin-rotation constant CN = 6.7(3) kHz and the unsplit line center frequency: 14NH3 (J, K) = s( 1, 0) - a(0, 0): 572 498.163( 10) MHz. The new results are in excellent agreement with existing high resolution Fourier transform data. The terahertz line frequencies are of considerably higher accuracy than the FT-data. by about two orders of magnitude. They will serve as future calibration lines. The ro-inversional transitions are of astrophysical interest

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