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Procedures have been developed which permit the highly selective silylation of the 3′-hydroxyl of ribonucleosides to produce 3′,5′-diprotected derivatives in high yields. 相似文献
135.
136.
Perturbation theory proves to be a powerful approach to obtain in analytic form both vibration-rotational energies and matrix elements of the dipole moment of diatomic molecules in terms of the expansion parameter = 2B
e/gwe,B
e and e being, respectively, the equilibrium rotational and harmonic vibrational spectral parameters. A systematic and efficient algorithm has been developed to execute such calculations with sufficient accuracy for most physical applications when the potential-energy function is accurately represented in the Dunham form. The method also provides analytic expressions of the Herman-Wallis coefficientsC
v
v
andD
v
v
for the vibration-rotational overtone bandsv
1v for diatomic molecules in1 electronic states. 相似文献
137.
A harmonic force field was developed for methanal azine. The force constants were used to calculate mean amplitudes of vibration, perpendicular amplitude correction coefficients and Coriolis coupling coefficients. 相似文献
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139.
J. F. Ogilvie 《光谱学快报》2013,46(8):1341-1354
The radial functions for potential energy and adiabatic and nonadiabatic effects in the forms of polynomials with coefficients cj, hj Li, hj X, gj Li and gj X of the reduced variable for internuclear distance z=2.(R-Re)/(R+Re) to various non-negative powers have been determined for the family of diatomic molecules of the lithium halides, LiF, LiCl, LiBr and LiI, with the corresponding results of LiH included for purposes of comparison. Trends are evident in the coefficients of lower order, but those of higher order are susceptible not only to the influence of the extent and quality of the data but also to the truncation of the power series in the representations. The various radial functions are valid with the specified ranges of internuclear distance depending on the maximum extent of vibrational excitation of the spectra. 相似文献
140.
For the electronic ground state X 1Σ+g, the potential-energy function of He2 reported by Aziz et al. has been transformed into the form V(z), containing only eight parameters, which is more suitable for the investigation of the existence of states of discrete energy. We found no evidence that a bound vibration-rotational state of the stable diatomic molecule 3He2 or 4He2, even if rotating, can exist in the electronic ground state. 相似文献