|
|
piaoma(金币+20): 2011-01-04 11:16:32
|
3) it depends what kind of frequency you got. for instance, if you have metal-metal stretch of -20, it is "huge", but if you have an Si-O-H bend of -30, sometimes it is negligible.. In a word, there are two factors: 1) atomic mass 2) mode of interest |
|