Two-level systems in myoglobin probed by non-Lorentzian hole broadening in a temperature-cycling experiment

Atusi Kurita, Yutaka Shibata, Takashi Kushida

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14 Citations (Scopus)

Abstract

We have measured the broadening of persistent spectral holes in H2-protoporphyrin-substituted myoglobin caused by temperature cycling between 4 and 70 K. Non-Lorentzian hole broadening has been observed for excursion temperatures above 40 K. This effect has been explained by assuming that the hole broadening is due to the transition-frequency shift of the chromophore by the random flips of the two-level systems, and that the these systems in the interior and in the exterior of the myoglobin molecule make different contributions to the broadening. From the analysis of the hole spectra, the number and the coupling strength of the TLS's in myoglobin have been determined.

Original languageEnglish
Pages (from-to)4349-4352
Number of pages4
JournalPhysical review letters
Volume74
Issue number21
DOIs
Publication statusPublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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