Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Spectral moment temperature variation

At a given temperature, absolute intensities are greatest for those pairs that differ the most in their electronic structure or nuclear charge, e.g., He-Xe shows stronger absorption than Ne-Xe or He-Kr. This is, of course, consistent with the fact mentioned above that like pairs (He-He) shows no absorption at all, but we point out that the variation of the spectral moments of the various pairs shown is relatively minor if data at the same temperature are considered, Table 3.1. [Pg.66]

Also shown in the figures are the theoretical temperature variations of the spectral moments (the curves). These are obtained from first principles in the case of H2-He and H2-H2 [279, 282] measurement and theory are in very close agreement. [Pg.100]

Fig. 3.45. Variation of the normalized spectral moment with density for the H2 fundamental band in pure hydrogen at various temperatures after [187],... Fig. 3.45. Variation of the normalized spectral moment with density for the H2 fundamental band in pure hydrogen at various temperatures after [187],...
For moment calculations, the accounting for the spectral moments hardly affects the spectral moments at the temperatures considered the extreme variation of the symmetry parameter ys from 0 to 1 modifies the moments M by less than 1% at 40 K, and much less at higher temperatures. It has been previously reported [315] that exchange symmetry matters at temperatures of less than 10 K. At the higher temperatures, one may often neglect symmetry (ys = 0 in Eq. 6.22) unless dimer features are considered the dimer structures of like pairs are in general dependent on symmetry at any temperature. [Pg.290]

Table 6.4. Temperature variation of the two- and three-body moments of the spectral function for the H2-Ar-Ar complex the superscripts (12) and (122) stand for H2-Ar and H2-Ar-Ar M(T) is actually the sum of and M(122)". Table 6.4. Temperature variation of the two- and three-body moments of the spectral function for the H2-Ar-Ar complex the superscripts (12) and (122) stand for H2-Ar and H2-Ar-Ar M(T) is actually the sum of and M(122)".
The spectral density S co) is flat in the case of native and of thermally denatured DNA (see Figure 9). These results show that— within the 2%-3% precision of noise measurements—it is not possible to assign a permanent dipole moment to the DNA molecule (see Section 4.2). The variations of R —at the same temperature—observed before and after the helix -> coil transition of DNA are related to counterion ejection phenomena described above and later in Section 4.1.2b. [Pg.413]


See other pages where Spectral moment temperature variation is mentioned: [Pg.244]    [Pg.20]    [Pg.624]    [Pg.331]    [Pg.156]    [Pg.241]    [Pg.74]    [Pg.228]    [Pg.53]    [Pg.351]    [Pg.228]    [Pg.3682]    [Pg.225]   
See also in sourсe #XX -- [ Pg.100 ]




SEARCH



Spectral moment

Temperature variations

© 2024 chempedia.info