Table 3.

Critical energy and calculated lowest internal energy of BP ions generated by SPALDI with chemically modified and untreated Si nanoparticles, and by MALDI with CHCA. 70 ns was used as the reaction time in the calculation. The results represent the energy for a laser fluence that induced minimal, yet measurable fragmentation. 4-Cl BP = 4-chloro benzylpyridinium, 2-Me BP = 2-methyl benzylpyridinium, 4-Me BP = 4-methyl benzylpyridinium, 3-MeO BP = 3-methoxy benzylpyridinium, 4-MeO BP = 4-methoxy benzylpyridinium. For more details about data herein reported, please refer to [61]. Adapted with permission from [61] Copyright Elsevier B.V, 2009.

	Critical Energy, E0 (eV)	Calculated Lowest Internal Energy of BP Ions (eV)
		C10 Modified Si	C6 Modified Si	C3 Modified Si	Untreated Si	CHCA
4-CL BP	1.73	3.5	-		4.5	3.7
2-ME BP	1.64	3.4	-		4.2	3.6
4-ME BP	1.6	3.4	-		4.1	3.0
3-MEO BP	1.68	3.7	-		4.8	4.3
4-MEO BP	1.3	2.8	3.0	3.5	3.9	3.2