Compatibility of Environmentally Friendly Insulating Gases CF₃I and c-C₄F₈ with Cu Contacts

Table 1

Adsorption energy, charge transfer, and Cu-F bond length.

Structure	Ead (eV)	Qt (e)	Cu-Fbefore (Å)	Cu-Fafter (Å)
c-C4F8	−0.633	−0.16	2.13	2.96
CF3I-top	−0.835	−1.04	4.85	3.31
CF3I-bridge	−0.993	−1.12	4.76	3.11
CF3I-fcc	−0.746	−0.26	4.71	5.25
CF3I-hcp	−0.691	−0.31	4.76	5.12
CF4	−0.514	−0.27	2.03	3.12
C2F4	−1.315	−0.32	2.56	2.84
C2F6	−0.674	−0.29	2.34	3.01
C3F6	−1.204	−0.45	2.49	2.86
C3F8	−0.783	−0.49	2.24	2.79