On Applicability of a Miniaturised Laser Ablation Time of Flight Mass Spectrometer for Trace Elements Measurements

Table 1

Measured and calculated isotope abundance ratio of Fe, Mo, and Pb oxides/sulphides and their diatomic clusters determined from the experiment and calculated from the multi-nominal expansions. The values marked by (*) are adopted from the calculation.

Element /cluster	Exp. abundance %	Nat. abundance %	Element /cluster	Exp. abundance %	Nat. abundance %
Fe			Pb
54	5.834	5.845	204	1.5	1.4
56	91.773	91.754	206	24.6	24.1
57	2.111	2.119	207	21.6	22.1
58	0.282*	0.282	208	52.4	52.4
FeO			PbS
70	5.45	6.12	236	1.419	1.331
71	0.32	0.48	237	0.010*	0.010
72	88.22	88.93	238	24.415	22.972
73	5.70	2.56	239	21.768	21.192
74	0.93	0.94	240	52.273	50.923
75	0.49*	0.49	241	1.334*	1.334
76	0.48*	0.48	242	2.9	2.231
			244	0.002*	0.002
			245	0.005*	0.005
Fe2			Pb2
108	0.66	0.40	408	0.018*	0.018
110	10.30	10.73	410	0.63*	0.63
111	0.41	0.31	411	0.57*	0.57
112	82.95	83.86	412	5.607	6.75
113	4.71	3.93	413	9.479	9.89
114	0.97	0.62	414	29.00	35.16
115	0.07*	0.07	415	19.456	21.50
116	0.06*	0.06	418	36.457	25.48
Mo			Mo2
92	14.78	14.77	184	1.945	2.079
94	8.66	9.23	186	2.234	2.598
95	16.32	15.90	187	4.293	4.476
96	18.02	16.68	188	5.415	5.508
97	9.61	9.56	189	5.396	5.489
98	23.41	24.19	190	11.72	12.15
100	9.20	9.67	191	7.27	6.74
			192	12.23	17.22
			193	11.33	10.37
			194	10.55	10.26
			195	8.18	7.34
			196	9.89	8.65
			197	1.64	1.76
			198	6.56	4.46
			200	1.34	0.89
MoO
108	14.40	14.734	114	25.47	24.169
109	0.006*	0.006	115	0.029*	0.029
110	8.90	9.238	116	9.810	9.696
111	15.90	15.865	117	0.004*	0.004
112	16.60	16.664	118	0.020*	0.020
113	9.30	9.576