[rajan]

Hi guys,
 i have a question regarding the photoluminescence instrument that my group uses. i'm posting a spectrum that i just got for my luminescent nanoparticles. on it you can see that there are 2 big humps, but in fact there should only be 1. the second one shows up no matter what sample is in the instrument, and i'm trying to figure out what it is. my hypothesis is that something in the photomultiplier tube (or detector) changes around 685 that shifts everything up substantially. i believe this because A: the peak should never be there and B: because the peak is too sharp and asymmetrical to be anything real.

anyone have thoughts on this?

Also, does anyone know of a way to get a computer using windows 95 to accept a USB stick?

thanks,

rajan