1 不可能
2 有可能，
【 在 hellaround (反对自由恋爱，提倡包办婚姻) 的大作中提到: 】
: As a non-chemist, I have a couple of questions on MS analysis which may sound stupid. Please laugh and help :)
: 1. Does the fragmentation pattern change with the analyte concentration?
: e.g. Is it possible that at lower analyte concentrations, the main fragment peak is m/z 291, while at higher concentrations, it is m/z 289?  
: ...................
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