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- Path: sparky!uunet!destroyer!cs.ubc.ca!unixg.ubc.ca!reg.triumf.ca!solu
- From: solu@reg.triumf.ca (SOLUK, RICHARD)
- Newsgroups: sci.physics
- Subject: A question about gas discharge tubes
- Date: 9 Nov 1992 15:33 PST
- Organization: TRIUMF: Tri-University Meson Facility
- Lines: 26
- Distribution: world
- Message-ID: <9NOV199215335294@reg.triumf.ca>
- NNTP-Posting-Host: reg.triumf.ca
- News-Software: VAX/VMS VNEWS 1.41
-
-
- If there is anyone out there who knows anything about gas discharge tubes I
- am trying to find an explanation for the following effect which was recently
- described to me.
-
- The apparatus was a standard discharge tube, i.e. simply a glass tube with
- high voltage electrodes at either end. The tube was initially evacuated and
- was allowed to slowly fill with gas. As the pressure increased the expected
- fluorescence occurred, but rather then involve the entire gas volume it was
- confined to a band which formed at one electrode and then began to propagate
- down the length of the tube (as a function of pressure). Additional bands
- appeared and followed the first keeping an equal spacing between bands.
- Finally five distinct bands were present which eventually stopped moving,
- intensified and merged into a uniform discharge. Note that the gas pressure
- was allowed to increase continuously throughout this process.
-
- The question I have is what effect would account for physical structure in
- the discharge? Why would a distinct band form rather then a discharge through
- the entire tube, or perhaps a number of equally spaced bands appearing
- simultaneously down the length of the tube?
-
- If you happen to know the explanation please drop me an email reply or post
- a response to the net.
-
- Thanks...
- Richard Soluk
-