Photoionization threshold of eumelanosomes determined using UV free electron laser - Photoelectron emission microscopy

Alexander Samokhvalov, Jacob Garguilo, W. C. Yang, Glenn S. Edwards, Robert J. Nemanich, John D. Simon

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The application of UV-free electron laser photoelectron emission microscopy (UV-FEL PEEM) to measure the threshold photoelectron spectrum and photoionization potential for human eumelanosomes is described. The origin of potential artifacts and the limitations of the technique are discussed and their potential effects on the measured photoionization potential are quantified. The UV-FEL-PEEM images collected on human eumelanosomes isolated from black hair show that the organelle is photoionized by UV-Bradiation. The photoionization threshold is determined to be 4.6 ± 0.2 eV. This result provides new insight into the origin of the differences between the photoionization and oxygen photoconsumption action spectra for eumelanins.

Original languageEnglish (US)
Pages (from-to)16334-16338
Number of pages5
JournalJournal of Physical Chemistry B
Volume108
Issue number42
DOIs
StatePublished - Oct 21 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Photoionization threshold of eumelanosomes determined using UV free electron laser - Photoelectron emission microscopy'. Together they form a unique fingerprint.

  • Cite this