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

doi:10.1021/jp046701q

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 journal › Article › peer-review

24 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 language	English (US)
Pages (from-to)	16334-16338
Number of pages	5
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	42
DOIs	https://doi.org/10.1021/jp046701q
State	Published - Oct 21 2004
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Photoionization threshold of eumelanosomes determined using UV free electron laser - Photoelectron emission microscopy",

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.",

author = "Alexander Samokhvalov and Jacob Garguilo and Yang, {W. C.} and Edwards, {Glenn S.} and Nemanich, {Robert J.} and Simon, {John D.}",

year = "2004",

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doi = "10.1021/jp046701q",

language = "English (US)",

volume = "108",

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T1 - Photoionization threshold of eumelanosomes determined using UV free electron laser - Photoelectron emission microscopy

AU - Samokhvalov, Alexander

AU - Garguilo, Jacob

AU - Yang, W. C.

AU - Edwards, Glenn S.

AU - Nemanich, Robert J.

AU - Simon, John D.

PY - 2004/10/21

Y1 - 2004/10/21

N2 - 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.

AB - 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.

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DO - 10.1021/jp046701q

M3 - Article

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JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 42

ER -

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

Abstract

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