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Another low-pressure-air discharge
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Instead of a jar this time I used a long tube to get a better look at the positive column. Interestingly it is red-colored which is characteristic of nitrogen, with very little of the characteristic white of oxygen shining through which is presumably what makes air discharges look purple. Looks almost like neon, but not as saturated of a red. Does anyone know why this discharge looks more nitrogen-y than other low pressure air discharges? Other pictures seem to look different. Anyway it looks cool.
Here it is running on AC hence why you can see the purple negative glow on both electrodes. Runs at a maximum of 8mA on a small neon sign transformer, and gets pretty hot after a bit. I definitely had a leak in this setup so the pressure didn't get as low as I had hoped, but I was too lazy to figure out where it was leaking from.
The glow you see from the glass is probably just dirt (I didn't clean it at all), not fluorescence, but I am not certain as I noticed it in the picture only after I put it all away.
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Search![Another low-pressure-air discharge
Instead of a jar this time I used a long tube to get a better look at the positive column. Interestingly it is red-colored which is characteristic of nitrogen, with very little of the characteristic white of oxygen shining through which is presumably what makes air discharges look purple. Looks [i]almost[/i] like neon, but not as saturated of a red. Does anyone know why this discharge looks more nitrogen-y than other low pressure air discharges? Other pictures seem to look different. Anyway it looks cool.
Here it is running on AC hence why you can see the purple negative glow on both electrodes. Runs at a maximum of 8mA on a small neon sign transformer, and gets pretty hot after a bit. I definitely had a leak in this setup so the pressure didn't get as low as I had hoped, but I was too lazy to figure out where it was leaking from.
The glow you see from the glass is probably just dirt (I didn't clean it at all), not fluorescence, but I am not certain as I noticed it in the picture only after I put it all away.
Keywords: Lamps](albums/userpics/10021/154/normal_poscolumn.jpg "Click to view full size image
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Another low-pressure-air discharge
Instead of a jar this time I used a long tube to get a better look at the positive column. Interestingly it is red-colored which is characteristic of nitrogen, with very little of the characteristic white of oxygen shining through which is presumably what makes air discharges look purple. Looks [i]almost[/i] like neon, but not as saturated of a red. Does anyone know why this discharge looks more nitrogen-y than other low pressure air discharges? Other pictures seem to look different. Anyway it looks cool.
Here it is running on AC hence why you can see the purple negative glow on both electrodes. Runs at a maximum of 8mA on a small neon sign transformer, and gets pretty hot after a bit. I definitely had a leak in this setup so the pressure didn't get as low as I had hoped, but I was too lazy to figure out where it was leaking from.
The glow you see from the glass is probably just dirt (I didn't clean it at all), not fluorescence, but I am not certain as I noticed it in the picture only after I put it all away.
Keywords: Lamps")
Glass can sometimes glow with UV or electron bombardment, but more noticeable as lower pressures. I tend to expect x-ray generation to occur at about the same time as the glass glows more than the gas discharge. Don't worry, X-ray generation only occurs at high potential and won’t be occurring here.