TY - JOUR AU - Bier, Dirk AU - Hartmann, Rudolf AU - Holschbach, Marcus TI - Collision-induced dissociation studies of caffeine in positive electrospray ionisation mass spectrometry using six deuterated isotopomers and one N1-ethylated homologue JO - Rapid communications in mass spectrometry VL - 27 IS - 8 SN - 0951-4198 CY - New York, NY PB - Wiley Interscience M1 - FZJ-2014-00400 SP - 885 - 895 PY - 2013 LB - PUB:(DE-HGF)16 UR - <Go to ISI:>//WOS:000316624400005 C6 - pmid:23495058 DO - DOI:10.1002/rcm.6520 UR - https://juser.fz-juelich.de/record/150330 ER -