Phase gratings in Fe3+‐doped triglycine sulphate single crystals recorded in the ultraviolet spectral region

1990 ◽  
Vol 56 (24) ◽  
pp. 2367-2369 ◽  
Author(s):  
G. Montemezzani ◽  
J. Fousek ◽  
P. Günter ◽  
J. Stankowska
Keyword(s):  
Single Crystals ◽  
Spectral Region ◽  
Triglycine Sulphate ◽  
Ultraviolet Spectral Region

Optical properties of KPb_2Cl_5 and RbPb_2Cl_5 single crystals in the far ultraviolet spectral region

2014 ◽  
Vol 31 (8) ◽  
pp. 1935 ◽  
Author(s):  
Igor N. Ogorodnikov ◽  
Natalia S. Bastrikova ◽  
Vladimir A. Pustovarov ◽  
Lyudmila I. Isaenko
Keyword(s):  
Optical Properties ◽  
Single Crystals ◽  
Spectral Region ◽  
Ultraviolet Spectral Region ◽  
Far Ultraviolet

Lattice and electronic structures of BAlN in the deep ultraviolet spectral region

2021 ◽  
pp. 413188
Author(s):  
Yue Dong ◽  
Wei Lin ◽  
Jinjian Yan ◽  
Changjie Zhou ◽  
Shuping Li ◽  
...  
Keyword(s):  
Electronic Structures ◽  
Spectral Region ◽  
Ultraviolet Spectral Region ◽  
Deep Ultraviolet

Standard of Purity for Cholesterol

1963 ◽  
Vol 9 (2) ◽  
pp. 121-134 ◽  
Author(s):  
Nathan Radin ◽  
Adalbert L Gramza
Keyword(s):  
Acetic Acid ◽  
Sulfuric Acid ◽  
Ethyl Alcohol ◽  
Spectral Region ◽  
Glacial Acetic Acid ◽  
Absolute Ethyl Alcohol ◽  
The Third ◽  
Derivative Method ◽  
Ultraviolet Spectral Region ◽  
Lower Limits

Abstract Three recrystallization technics were used to fractionate five commercial cholesterol products and one artificial mixture. One technic involved the recrystallization of cholesterol from absolute ethyl alcohol, the second technic involved the recrystallization of cholesterol from glacial acetic acid, and the third technic used the dibromide derivative method. The molar absorptivities for the various crystal batches were in the range of 1610 to 1750 L. mole-1 cm.-1 at 620 mµ with a modified Liebermann-Burchard procedure. The molar absorptivities were in the range of 9,800 to 11,500 L. mole-1 cm.-1 at 560 mµ with a modified sulfuric acid-iron method. The original products and the ethyl alcohol recrystallized products showed molar absorptivities at the lower limits of the ranges, while the glacial acetic acid and dibromide derivative recrystallized cholesterol showed molar absorptivities at the higher limits of the ranges. Absorption peaks at 235 mµ for methyl alcohol solutions of the cholesterol preparations were used to estimate cholesterol impurities on the basis of 7-keto cholesterol acetate absorption values. The decrease of absorption in the ultraviolet spectral region established that impurities were removed from the cholesterol preparations studied.

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