Abstract There has been a constant improvement in the observational measurement of linear polarization chromospheric spectral lines last three decades. However, modeling polarized profiles these still remains incomplete, due to lack inclusion fundamental physics efforts. To model observed solar spectrum and its polarization, we need solution radiative transfer equation. The strong resonance ori...

In the title compound, C16H13FO3S, the dihedral angle between the mean planes of the benzo-furan ring system and the 3-methyl-phenyl ring is 80.96 (4)°. In the crystal, mol-ecules are linked via pairs of π-π inter-actions between furan and benzene rings, with centroid-centroid distances of 3.758 (1) and 3.771 (1) Å. A similar inter-action is found between furan rings, with a centroid-centroid d...

The title compound 1-OPBB, C(19)H(19)BrO(2), contains a dechlorinated and hydrogenated isodrin backbone with an anti-4-bromo-benzoate substituent at one of the methano bridges. The dihedral angle between the CO(2) ester plane and the benzene ring plane is 8.5 (2)°. In the crystal, the ester groups stack over benzene rings: the mol-ecules pack as conformational enanti-omers, with nearest paralle...

In the title compound, C23H22ClNO4 (systematic name: (RS)-2-(4-chloro-phen-yl)-N-{2-[3-meth-oxy-4-(prop-2-yn-1-yl-oxy)phen-yl]eth-yl}-2-(prop-2-yn-yloxy)acetamide), an amide fungicide, the dihedral angle between the chloro-benzene and benzene rings is 65.36 (6)°. In the crystal, N-H⋯O hydrogen bonds lead to zigzag supra-molecular chains along the c axis (glide symmetry). These are connected int...

In the title salt, C(17)H(14)Cl(2)N(+)·C(12)H(4)N(4) (-), cations and anions stack along the a axis into segregated columns by π-π stacking inter-actions, with alternating centroid-centroid separations of 3.5957 (7) and 3.7525 (7) Å for the cation column and 3.4252 (6) and 4.1578 (7) Å for the anion column. In the cation, the dihedral angle between the benzene ring and the quinoline ring system...

The title compound, C(13)H(10)Cl(2)N(2)S, represents a monoclinic polymorph of the previously reported ortho-rhom-bic form [Ramnathan et al. (1996 ▶). Acta Cryst. C52, 134-136]. The mol-ecule is twisted with the dihedral angle between the benzene rings being 55.37 (7)°. The N-H atoms are syn to each other, which contrasts their anti disposition in the ortho-rhom-bic form. In the crystal, mol-ec...

In the title compound, C21H17N3OSe, the dihedral angles between the central five-membered ring and the C- and N-bound rings are 17.89 (10) and 42.35 (10)°, respectively, indicating the mol-ecule is twisted. The dihedral angle between the Se-bound rings is 85.36 (10)°. A close intra-molecular Se⋯O contact of 2.8507 (13) Å is noted. In the crystal, C-H⋯O, C-H⋯N and C-H⋯π inter-actions lead to the...

In the title compound, C24H17ClFN3S, the pyrazole ring is almost planar (r.m.s. deviation = 0.030 Å). With the exception of the methine-bound benzene ring, which forms a dihedral angle of 85.77 (13)° with the pyrazole ring, the remaining non-C atoms lie in an approximate plane (r.m.s. deviation = 0.084 Å) so that overall the mol-ecule has a T-shape. In the crystal, centrosymmetrically related m...

Transition radiation (TR) from ultrarelativistic particles is considered. It is shown that performing collimation of the TR from the periodic N-foil stack (parameters of which are selected in a appropriate manner) one obtains the spectrum of the TR which has a form of a peak position of which ω1 depends on the plasma frequency and the thickness of the radiator foils. The height and width of the...