Patent ID: 11915901
Assignee: ULVAC-PHI, INCORPORATED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A surface analysis apparatus based on energy analysis of secondary electrons or mass analysis of secondary ions, comprising:
a DC primary excitation source resulting in characteristic secondary electrons to be energy analyzed or secondary ions to be mass analyzed;
a source of a pulsed positive ion flood neutralizer beam;
a source of an electron flood neutralizer beam; and
independent columns for the positive ion flood neutralizer beam and the electron flood neutralizer beam,
wherein the source of a pulsed positive ion flood neutralizer beam and the source of an electron flood neutralizer beam are independently controllable and provide dual polarity flood beams to effect neutralization of surface charge and surface potential variation, and
wherein the dual polarity flood beams comprise an electron beam and a positively charged ion beam and at least the positively charged ion beam is pulsed.