A Caltech Library Service

The Metastable 2p3-State of Mercury Atoms

Loria, S. (1925) The Metastable 2p3-State of Mercury Atoms. Proceedings of the National Academy of Sciences of the United States of America, 11 (11). pp. 673-679. ISSN 0027-8424. PMCID PMC1086209. doi:10.1073/pnas.11.11.673.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Let us consider a mixture of mercury vapor, thallium vapor and nitrogen in a closed quartz tube under well defined conditions of pressure and temperature, illuminated by λ 2537A of constant intensity. Due to the absorption of the illuminating radiation a constant number N of mercury atoms will be activated in unit time. Those activated atoms persist in the 2p2-state for a finite time t which is known to be of the order of magnitude of 10^-7 sec [1]. If they escape collision during this period they return to their normal state in the ordinary wave-emitting radiation (resonance). They may, however, while activated, collide with nitrogen molecules, normal mercury atoms or normal thallium atoms. We shall assume, for the present, that the amount of nitrogen and thallium sufficiently exceeds the amount of mercury, so that we may disregard totally the collisions between activated and normal mercury atoms. We assume furthermore that all collisions between activated mercury atoms and thallium atoms result in the activation of the latter, producing the fluorescence radiation of thallium with a constant energy distribution between its different lines.

Item Type:Article
Related URLs:
URLURL TypeDescription CentralArticle
Additional Information:© 1925 by the National Academy of Sciences. Communicated August 21, 1925. The author wishes to express his best thanks to Miss Louise Ware for the very careful microphotometric examination of the plates and his appreciation to Dr. W.S. Adams, Director of the Mount Wilson Observatory, Dr. E. Pettit and Dr. S.B. Nicholson for the permission to use the facilities of their laboratory for this purpose.
Issue or Number:11
PubMed Central ID:PMC1086209
Record Number:CaltechAUTHORS:LORpnas25
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6760
Deposited By: Archive Administrator
Deposited On:21 Dec 2006
Last Modified:08 Nov 2021 20:36

Repository Staff Only: item control page