29 Sep
2012
29 Sep
'12
10:22 p.m.
From: ard at p850ug1.demon.co.uk
Subject: Re: gas discharge lamp colors Re: strange remark about your collection?
To: cctalk at classiccmp.org
Date: Sat, 29 Sep 2012 20:30:11 +0100
Hi
While the greenish color see is from the glass, oxygen does have a bluish
green glow of its own. It can be seen in nebula like the veil nebula.
It can seen in comets heads as they get impacted by particals from
the sun.
It is not the brightest of the colors that glow in the visibe band.
Sodium yellow out shines most all of them.
Dwight
On Fri, 28 Sep 2012, Dave McGuire wrote:
> On 09/28/2012 01:29 PM, Alexey Toptygin wrote:
>> On Thu, 27 Sep 2012, Tony Duell wrote:
>>
>>> No. AFAIK _no_ green displays are nixie tubes (what gas would they have
>>> to contain I wonder?)
>>
>> Oxygen at a suitable pressure? IIUC at very low pressure it glows red,
>> at higher pressure it glows green and at suffieciently high pressure the
Are you sure that oxygen can be got to give a gree nglow? I asked my
father about this, who has done a _lot_ of work on vacuum systems, and he
claimed it doesn;t. The (foten green) glow you see at very low pressures
is in fac the glass fluorescing.