Back-Matter V. 15, No. 1

Cover vol. 15, no. 1, February 2018

Persian-translation vol. 15, no. 1, February 2018

Cover Special (1) Issue vol. 15, no. 7, October 2018

The Rigaku Journal Vol. 22 / No. 1 / 2005, 2–15

X-ray powder diffraction assumes many roles in the analysis of pharmaceuticals. Pharmaceuticals, typically organic solids, exist in numerous solid forms that feature different physical and chemical properties. The vast majority of pharmaceuticals are administered as oral tablet dosage forms. In order for a drug molecule to be absorbed by the body, it must first dissolve. One of the most effecti...

Ultra - violet absorption cross sections of isotopically substituted nitrous oxide species : 14 N 14 NO , 15 N 14 NO , 14 N 15 NO and 15 N 15 NO

The isotopically substituted nitrous oxide species 14N14NO, 15N14NO, 14N15NO and 15N15NO were investigated by ultra-violet (UV) absorption spectroscopy. High precision cross sections were obtained for the wavelength range 181 to 218 nm at temperatures of 233 and 283 K. These data are used to calculate photolytic isotopic fractionation constants as a function of wavelength. The fractionation con...