Untersuchungen über die Adsorption von Gasen von kleinsten bis zu höchsten Drucken

Zusammenfassung Die Dichte der Kohle wurde pyknometrisch mit flüssigem Stickstoff neu bestimmt und gleich 1,98 gefunden. Die früher erhaltenen Werte der Adsorption von Argon und Stickstoff wurden auf die neue Dichte umgerechnet und die Adsorption als Funktion der Dichte dargestellt.     

Über den Nachweis und die Bestimmung des Arzneimittels 2-Amino-4-methyl-pyridin (I)

Analytical and Bioanalytical Chemistry -     

Mode-locked lasers and ultrashort light pulses

This article reviews some aspects of the generation of very short optical pulses using mode-locked lasers, with the emphasis laid on pulsed laser systems. Active and passive mode-locking is discussed, and the problem of measuring ultrashort light pulses is considered. A survey of some commonly used sources and techniques for the generation of ultrashort light pulses follows. The paper concludes with a short account of limitations in the generation and propagation of these pulses.     

Die Geschwindigkeitsabhängigkeit totaler Streuquerschnitte von Alkalien an Edelgasen

The velocity dependence of the total scattering cross section has been measured for 10 different combinations of alkali atoms with rare gas atoms. By means of an automated fast comparison technique the precision of relative values ofQ(ν) can be increased to 10^?3. In the eight cases where Ar, Kr or Xe is the scattering gas, undulations ofQ(ν) about its mean value have been observed. The precision of the method allows us in these cases to extract reliable information on the amplitude of the undulations. Use of this additional information makes it impossible to explain the experimental results with the simple, 2- or 3-parameter potentials that are generally used. Deferring a final evaluation to a later paper, we restrict ourselves here to giving, for the Lennard-Jones (8?6) potential, a table of?r _m values.