Zur Vergrauung von Entladungsgefäßen

Details Zur Vergrauung von Entladungsgefäßen Zur Vergrauung von Entladungsgefäßen

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apphy...7...93k&link_type=abstract

Applied Physics, Volume 7, Issue 2, pp.93-97

Physics

2

Index Headings Darkening Of Discharge Tubes - Damage Of Vitreous Surfaces, Darkening Of Discharge Tubes, Damage Of Vitreous Surfaces

Scientific paper

Vitreous discharge tubes for low-pressure mercury vapor lamps will display after about 1000 hrs of operation a greyish appearance which increases with time. Said darkening can be simulated within a short period of time by applying an electric field transverse to the discharge. The transverse field causes migration of sodium ions of the glass towards the discharge. These ions migrate to the inner surface of the glass where they amalgamate. Even in normal ac operation of the discharge minor dc Na+ currents pass through the glass of the envelope towards the discharge. The deposited Na atoms amalgamate with the mercury of the discharge on the inner wall surface of the tube thereby producing a light absorbing coating.

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