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

Claim 21:
22. An ion spectroscopic apparatus comprising:
a pulsed primary excitation source which generates secondary ions to be mass analyzed, a source of a pulsed positive ion flood neutralizer beam;
a source of a pulsed 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, wherein the pulsed charge neutralizing flood beams are interleaved with the pulsed primary excitation source, and
wherein the dual polarity flood beams comprise a pulsed electron beam and a pulsed positively charged ion beam.