Table 2.

Relative peak intensities of (CH₃)AuP(CH₃)₃ fragments at 50 eV electron impact energy observed in the DI mass spectrum (Figure 3) and relative integral intensities from thresholds to 50 eV derived from the ion yield curves shown in Figure 5. The FEBID deposits compositions from the current UHV and the previous HV experiments are shown at the bottom of the table.

Fragment	m/z	Relative DI Yield (Intensity)		Relative DI Yield (Integration)
[AuP(CH3)3]+	273	78.41		79.07
[AuP(CH3)2]+	258	5.64		13.30
[AuP(CH3)]+	243	2.36		0.36
[Au]+	197	0.51		0.29
[P(CH3)3]+	76	64.78		78.98
[P(CH3)3 − H]	75	33.12		28.47
[HP(CH3)(CH2)]+	61	100		100
[P(CH3)2 − 2H]+	59	68.8		68
[P(CH3)2 − 4H]+	57	26.19		17.98
[P(CH3)]+	46	14.1		2.54
[P(CH3) − H]+	45	33.7		24.7
Avrg. C loss per incident		1.94		2.01
Avrg. P loss per incident		0.80		0.76
UHV deposit composition	31–34 at.% Au	65–67 at.% C	1–2 at.% P
HV deposit composition	19–25 at.% Au	54–62 at.% C	12–16 at.% P	2–7 at.% O