This is a butane gas torch, filled from a little butane aerosol can. As for why the 'OH' peak is high on mine, the spectrometer is setup for irradiance measures, which corrects for the drop off in sensitivity at the extremes of the measurement range. A lot of the spectra you see when it just has the axis labelled as 'intensity' have not had this correction, which would explain why the OH peak looks small on some. Also, I doubt the butane in that aerosol is particularly pure - a bit of water in there with it would lead to a bigger OH peak.
Steve, when I was growing up we had coal fires at home, and one of the fires had a back boiler for the water. In the morning our cat would climb up inside the chimney and sleep on the ledge on top of the boiler because it was nice and warm. We had to check the chimney every day before lighting the fire, to make sure that cat wasn't up there.
Edited by JMC, 12 April 2019 - 10:58.