0 any one of a group of chemical substances which all have the same number and type of atoms but in which the arrangement of the atoms is slightly different between each substance -- （同分）异构体
structural/geometrical/optical isomers 结构／几何／光学同分异构体
An experimental perspective on triggering gamma emission from nuclear isomers.
These studies investigate under-well defined physico-chemical conditions synthetic routes how the simplest carbon hydrate-glycolaldehyde-and the simplest amino acid-glycine-together with their isomers can be formed.
In the other isomers, where the two groups are linked together, the carbonyl group attracts the electrons, which destabilizes the protonated amine.
If both the isomers are separated, yields decrease by 50 %, if they are not separated, distance distributions are broadened.
As can clearly be seen, the mass spectra show that the fragmentation patterns between the isomers are different for both wavelengths and polarizations.
The suffixes "-c" for cis and "-t" for trans refer to geometric isomers.
Consequently, the same isomers were studied as before, first protonated on the acid group, then on the amine group.
In particular, the possibility of exciting the nuclear states in longer-living isomers via the action of the laser-produced plasma is extremely attractive.
