28 Sep
2012
28 Sep
'12
2 p.m.
On 09/28/2012 04:14 PM, Alexey Toptygin wrote:
On Fri, 28 Sep 2012, Dave McGuire wrote:
I don't remember how the halogen cycle works in those bulbs...you
probably do; would that not address the corrosion issue in that case?
On 09/28/2012 01:29 PM, Alexey Toptygin wrote:
Can it be that bad? In halogen lamps the envelope is full of chlorine
which is even more electronegative than oxygen. Admittedly the valence
is different, you're not discharging through the gas, and the lower
pressure will make the tungsten evaporate faster, but I imagine/hope it
would at least last hours or days. Alternatively, you could try to build
a barrier that's impermeable to oxygen but permeable to high energy
electrons. But I'm probably overthinking it. On Thu, 27 Sep 2012, Tony Duell wrote:
Uhh...ya think? ;) I'd bet the electrode life would be measured in
single- or two-digit MINUTES depending on their thickness. 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
decay is non-radiative. I'm guessing you'd have problems with electrode
erosion though. Surely there is another
element that will emit mostly in the green part of the spectrum?
Neon itself has several green spectral emission lines, hence the
existence of "GreNe" lasers, but they are of far lower in intensity than
the red/orange lines.
Every green gas-discharge bulb I've seen has had a phosphor coating
somewhere, so my assumption (and that's all this is) is that there's not
enough intensity there to be useful.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA