Recent content by Lotic7

The J305 Geiger tube was removed from the Geiger counter and placed in its separate holder. A USB ionizer was used to power it. The USB coupling was removed from the ionizer, and 3 AA batteries in series were hooked up as the power source (no counter attached). The USB ionizer consists of an...

This is correct. The UV-C will not be able to directly ionize the fill gas (it doesn't have the required energy). The UV-C has to interact with the tin oxide cathode and discharge some electrons (photoelectric effect). These electrons will be attracted to the anode and will have enough energy...

Vanadium 50 said: The UV is not ionizing the gas in the tube, presumably argon. The ionization potential for Ar, O2 and N2 are all about the same, way in the VUV. The fill gas in a geiger tube is usually at a lower pressure than atmospheric to reduce the ionization potential. This is a diagram...

I separated the GM from the rest of the board I exposed the separated GM tube to a incandescent bulb (Phillips Duramax 60W) and the average count was 98.4 beeps per minute. I put a welding glass filter (shade #12) between the GM and the incandescent bulb. The count was similar to background...

When the counter display became garbled when it was exposed to the UVC lamp, it might have been due to overheating. The counter had been running for an hour or two with light sources right up against the case. I was using a cheap battery powered cell phone charger to supply the five volts to...

I purchased a RadiationD-v1.1(Cajoe) geiger counter off ebay, and attached an arduino nano and a 16x2 display ( I got the instructions off this site https://www.instructables.com/id/Arduino-DIY-Geiger-Counter/). I noticed that the counter was sensitive to UV when I had it out in the sunlight, so...

Thanks for the help. I will have to get some diffraction grating, and try this out.

I purchased the 660nm LEDs off amazon. There are no no manufacturer markings on them, but they work. I guess you get what you pay for. How well would a digital camera work in analyzing the spectrum? If a picture was taken of the lit LED or after the light from the LED was put through a prism and...

I recently purchased some 660nm LEDs. They look kind of orange not deep red. What is the easiest and cheapest way to determine the emission spectrum. Eventually I wanted to try to use the 660nm LEDs to grow some plants.

Lawesson's reagent was first created in 1956 ( J. Am. Chem. Soc., 1956, 78 (19), pp 5018–5022), so I am not sure why the book mentions 1978. Maybe that was the first time it was used specifically for thiophene synthesis.

I was able to get some answers after doing a search on google for "Paal thiophene synthesis". There was a link to a book preview in google books...

I had this synthesis question on my last midterm and got it wrong. I was wondering if someone here could point me in the right direction. It is a thiophene synthesis that starts off with a 1,4 diketone, but instead of P2S5 or Lawesson's reagent, H2S and HCl are used. I tried to hydrate one of...