Correlations of the boson peak with positron annihilation in series of polycarbonate copolymers

Christopher L. Soles; Robert M. Dimeo; Dan A. Neumann; Alexander Kisliuk; Alexei P. Sokolov; Jianwei Liu; Albert F. Yee; Wen Li Wu

doi:10.1021/ma001913g

Correlations of the boson peak with positron annihilation in series of polycarbonate copolymers

Christopher L. Soles, Robert M. Dimeo, Dan A. Neumann, Alexander Kisliuk, Alexei P. Sokolov, Jianwei Liu, Albert F. Yee, Wen Li Wu

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

The low-frequency vibrations of the Boson peak are observed with inelastic neutron and Raman scattering in a homologous series of polycarbonate copolymers. In accordance with the notion that the Boson peak is predominantly an acoustic phenomenon, the Boson peak energy is found to correlate with the velocity of sound. However, a striking inverse correlation is observed between the Boson peak energy and the average size of the unoccupied volume elements (approximately 5-6 Å in diameter) evidenced by positron annihilation lifetime spectroscopy (PALS). The apparent correlation between the Boson peak energy and PALS data is discussed in terms of a relationship between the elastic modulus and the electron density heterogeneities.

Original language	English
Pages (from-to)	4082-4088
Number of pages	7
Journal	Macromolecules
Volume	34
Issue number	12
DOIs	https://doi.org/10.1021/ma001913g
State	Published - Jun 5 2001
Externally published	Yes

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title = "Correlations of the boson peak with positron annihilation in series of polycarbonate copolymers",

abstract = "The low-frequency vibrations of the Boson peak are observed with inelastic neutron and Raman scattering in a homologous series of polycarbonate copolymers. In accordance with the notion that the Boson peak is predominantly an acoustic phenomenon, the Boson peak energy is found to correlate with the velocity of sound. However, a striking inverse correlation is observed between the Boson peak energy and the average size of the unoccupied volume elements (approximately 5-6 {\AA} in diameter) evidenced by positron annihilation lifetime spectroscopy (PALS). The apparent correlation between the Boson peak energy and PALS data is discussed in terms of a relationship between the elastic modulus and the electron density heterogeneities.",

author = "Soles, {Christopher L.} and Dimeo, {Robert M.} and Neumann, {Dan A.} and Alexander Kisliuk and Sokolov, {Alexei P.} and Jianwei Liu and Yee, {Albert F.} and Wu, {Wen Li}",

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T1 - Correlations of the boson peak with positron annihilation in series of polycarbonate copolymers

AU - Soles, Christopher L.

AU - Dimeo, Robert M.

AU - Neumann, Dan A.

AU - Kisliuk, Alexander

AU - Sokolov, Alexei P.

AU - Liu, Jianwei

AU - Yee, Albert F.

AU - Wu, Wen Li

PY - 2001/6/5

Y1 - 2001/6/5

N2 - The low-frequency vibrations of the Boson peak are observed with inelastic neutron and Raman scattering in a homologous series of polycarbonate copolymers. In accordance with the notion that the Boson peak is predominantly an acoustic phenomenon, the Boson peak energy is found to correlate with the velocity of sound. However, a striking inverse correlation is observed between the Boson peak energy and the average size of the unoccupied volume elements (approximately 5-6 Å in diameter) evidenced by positron annihilation lifetime spectroscopy (PALS). The apparent correlation between the Boson peak energy and PALS data is discussed in terms of a relationship between the elastic modulus and the electron density heterogeneities.

AB - The low-frequency vibrations of the Boson peak are observed with inelastic neutron and Raman scattering in a homologous series of polycarbonate copolymers. In accordance with the notion that the Boson peak is predominantly an acoustic phenomenon, the Boson peak energy is found to correlate with the velocity of sound. However, a striking inverse correlation is observed between the Boson peak energy and the average size of the unoccupied volume elements (approximately 5-6 Å in diameter) evidenced by positron annihilation lifetime spectroscopy (PALS). The apparent correlation between the Boson peak energy and PALS data is discussed in terms of a relationship between the elastic modulus and the electron density heterogeneities.

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U2 - 10.1021/ma001913g

DO - 10.1021/ma001913g

M3 - Article

AN - SCOPUS:0035811318

SN - 0024-9297

VL - 34

SP - 4082

EP - 4088

JO - Macromolecules

JF - Macromolecules

IS - 12

ER -

Correlations of the boson peak with positron annihilation in series of polycarbonate copolymers

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