Vibrational relaxation of excited states in a series of carotenes with several polyene lengths

Masayuki Yoshizawa; Hideki Hashimoto

doi:10.1117/12.453738

Vibrational relaxation of excited states in a series of carotenes with several polyene lengths

Masayuki Yoshizawa, Hideki Hashimoto

SCI - Physics

Research output: Contribution to journal › Conference article › peer-review

1 Citation (Scopus)

Abstract

Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited IB_u^- state to the 2A_g^- state is faster in the carotenes with middle polyene lengths. The vibrational relaxation of the 2A_g^- state has fast and slow components. The time constant of the slow component is longer than several picoseconds. The 2A_g^- state in the short carotenes remains in the vibrational excited levels because of the slow vibrational relaxation. These properties can be explained in terms of the 1B_u^- state which assists the internal conversion to the 2A_g^- state and the fast vibrational relaxation of the 2A_g^- state. The vibrational features of the excited states in carotenoids is very important in energy transfer mechanism of bacterial photosynthesis.

Original language	English
Pages (from-to)	15-23
Number of pages	9
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	4812
DOIs	https://doi.org/10.1117/12.453738
Publication status	Published - 2002 Dec 1
Event	Nonlinear Spectroscopy - Seattle, WA, United States Duration: 2002 Jul 8 → 2002 Jul 9

Keywords

Carotenoid
Femtosecond Raman spectroscopy
Vibrational relaxation

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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title = "Vibrational relaxation of excited states in a series of carotenes with several polyene lengths",

abstract = "Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited IBu- state to the 2Ag- state is faster in the carotenes with middle polyene lengths. The vibrational relaxation of the 2Ag- state has fast and slow components. The time constant of the slow component is longer than several picoseconds. The 2Ag- state in the short carotenes remains in the vibrational excited levels because of the slow vibrational relaxation. These properties can be explained in terms of the 1Bu- state which assists the internal conversion to the 2Ag- state and the fast vibrational relaxation of the 2Ag- state. The vibrational features of the excited states in carotenoids is very important in energy transfer mechanism of bacterial photosynthesis.",

keywords = "Carotenoid, Femtosecond Raman spectroscopy, Vibrational relaxation",

author = "Masayuki Yoshizawa and Hideki Hashimoto",

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journal = "Proceedings of SPIE - The International Society for Optical Engineering",

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T1 - Vibrational relaxation of excited states in a series of carotenes with several polyene lengths

AU - Yoshizawa, Masayuki

AU - Hashimoto, Hideki

PY - 2002/12/1

Y1 - 2002/12/1

N2 - Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited IBu- state to the 2Ag- state is faster in the carotenes with middle polyene lengths. The vibrational relaxation of the 2Ag- state has fast and slow components. The time constant of the slow component is longer than several picoseconds. The 2Ag- state in the short carotenes remains in the vibrational excited levels because of the slow vibrational relaxation. These properties can be explained in terms of the 1Bu- state which assists the internal conversion to the 2Ag- state and the fast vibrational relaxation of the 2Ag- state. The vibrational features of the excited states in carotenoids is very important in energy transfer mechanism of bacterial photosynthesis.

AB - Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited IBu- state to the 2Ag- state is faster in the carotenes with middle polyene lengths. The vibrational relaxation of the 2Ag- state has fast and slow components. The time constant of the slow component is longer than several picoseconds. The 2Ag- state in the short carotenes remains in the vibrational excited levels because of the slow vibrational relaxation. These properties can be explained in terms of the 1Bu- state which assists the internal conversion to the 2Ag- state and the fast vibrational relaxation of the 2Ag- state. The vibrational features of the excited states in carotenoids is very important in energy transfer mechanism of bacterial photosynthesis.

KW - Carotenoid

KW - Femtosecond Raman spectroscopy

KW - Vibrational relaxation

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DO - 10.1117/12.453738

M3 - Conference article

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EP - 23

JO - Proceedings of SPIE - The International Society for Optical Engineering

JF - Proceedings of SPIE - The International Society for Optical Engineering

SN - 0277-786X

T2 - Nonlinear Spectroscopy

Y2 - 8 July 2002 through 9 July 2002

ER -

Vibrational relaxation of excited states in a series of carotenes with several polyene lengths

Abstract

Keywords

ASJC Scopus subject areas

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