[The chemiluminescence and fluorescence of aromatic amino acids in the presence of iodine].
Optic characteristics of solutions of aromatic amino acids containing fluorine products were examined by adding iodine solution. Iodine exerted variously directed effects on the intensity of photochemiluminescence of tryptophan, thyrosine, and beta-indolacetic acid solutions. Extinction of the luminescence of beta-indolacetic acid accumulating in an organism during tumors may be used as an additional test for the differential diagnosis of cancer.
The evolution of atomic de Broglie waves inside strong periodic potentials can be described as channeling and exhibits both particle and wave effects. Using a beam of metastable Argon atoms interacting with an intense standing light wave we detect an interference pattern arising from the coherent guiding of the atoms through the light channels. In analogy to light optics these interference effects are only visible, if certain requirements for longitudinal and transverse coherence are fulfilled. We experimentally study the influence of the velocity selection and the collimation of the Argon atoms. As well as an another factor determining the coherence of the evolution - the spontaneous emission. q 2000 Elsevier Science B.V. All rights reserved.