Far-infrared emission by boson peak vibrations in a globular protein

被引：54

作者：

Leyser, H ^{[1
]}

Doster, W ^{[1
]}

Diehl, M ^{[1
]}

机构：

[1] Tech Univ Munich, Phys Dept E 13, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 14期

关键词：

D O I：

10.1103/PhysRevLett.82.2987

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Raman- and neutron-scattering spectra of proteins and supercooled liquids display a common feature at low frequency, the boson peak. We elucidate its microscopic nature in relation to biological activity and the glass transition. Our experiments show that optical pumping of a heme protein leads to nonthermal emission in the far-infrared related to boson peak vibrations. The vibronic relaxation of the heme group channels energy into far-infrared modes which are damped with temperature and hydration. The results are consistent with a viscoelastic model of boson peak excitations. [S0031-9007(99)08836-5].

引用

页码：2987 / 2990

页数：4

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