[Murka]

Hey guys, I'm not a native english speaker, so I need to find the right terminology for those tiny symmetric peaks that you get on HNMR, usually from sharp singlets, we were taught that they're due to innate device errors, but I'd like to find out more...see attached image

[Dan]

Satellites - more specifically ¹³C satellites.

http://en.wikipedia.org/wiki/Carbon-13_NMR_satellite

[Murka]

Thank you!
It's really frustrating when you know what you mean and you don't even know how to start searching for it on the internet

[Babcock_Hall]

I don't want to confuse things, but it depends on the spacing between the small peak and the large one.  If the spacing is about (0.5)J_CH, then they are satellites.  The area of the small peak should be roughly 0.5% of the area of the large peak, but this might be difficult to measure.  The only other possibility is that they are spinning side bands.  Those show up about 15-20 Hz from the main peak, depending on the spinning rate of the sample.  I think both may be present in this diagram.

[Murka]

So, where can I read more about those spinning sidebands?

[Babcock_Hall]

I found the link below, which has both satellites and spinning side bands.  IIRC if the nonspinning shims (the ones with x's and y's in the names) are far away from their optimal values, the side bands are more prominent.  Tube quality also plays a role.  So which lines in your spectrum are side bands, and which ones are satellites?
http://triton.iqfr.csic.es/guide/man/beginners/chap5-3.htm