Permanent Hole-Burning with a Diode-Laser. Excited State Dynamics of Bacteriochlorophyll in Glasses and Micelles

Thomas Schmidt; H. E. Smorenburg; S. Völker; H. van der Laan

Permanent Hole-Burning with a Diode-Laser. Excited State Dynamics of Bacteriochlorophyll in Glasses and Micelles

Thomas Schmidt, H. E. Smorenburg, S. Völker, H. van der Laan

Institute of Biophysics

Research output: Other contribution

Abstract

A temperature- and current-controlled diode laser at ~780nm was used to perform permanent hole-burning experiments on the S1<-S0 0-0 (Qy) transition of bacteriochlorophyll-a (BChl-a) in amorphous hosts. Hole widths were obtained for the glass triethylamine (TEA) between 0.4 and 15K, for micelles of the detergent lauryldimethylamine N-oxide (LDAO) between 1.2 and 4.2K, and for wet and dry CCl4 at 1.2K. The homogeneous linewidth, Ghom, of BChl-a in TEA follows a T^1.3 dependence at temperatures T<7K, wheras at T~7K a crossover to an exponential dependence with an activation energy of 33cm^-1 is observed. The results, when compared with those obtained for free-base porphin in the same glass, suggest that a low-frequency mode of TEA is responsible for the dephasing. From the experiments on micelles conclusions are drawn about the molecular confirmations of BChl-a in the detergent.

Original language	English
Publication status	Published - 1992

Fields of science

103 Physics, Astronomy
104014 Surface chemistry
104015 Organic chemistry
106002 Biochemistry
106006 Biophysics
106013 Genetics
106023 Molecular biology
206001 Biomedical engineering
206002 Electro-medical engineering
206003 Medical physics
210006 Nanotechnology
301902 Immunology
304003 Genetic engineering

Cite this

@misc{f59b955ce23d4f8f8d0c4e66f04b8b9c,

title = "Permanent Hole-Burning with a Diode-Laser. Excited State Dynamics of Bacteriochlorophyll in Glasses and Micelles",

abstract = "A temperature- and current-controlled diode laser at \textasciitilde{}780nm was used to perform permanent hole-burning experiments on the S1<-S0 0-0 (Qy) transition of bacteriochlorophyll-a (BChl-a) in amorphous hosts. Hole widths were obtained for the glass triethylamine (TEA) between 0.4 and 15K, for micelles of the detergent lauryldimethylamine N-oxide (LDAO) between 1.2 and 4.2K, and for wet and dry CCl4 at 1.2K. The homogeneous linewidth, Ghom, of BChl-a in TEA follows a T\textasciicircum{}1.3 dependence at temperatures T<7K, wheras at T\textasciitilde{}7K a crossover to an exponential dependence with an activation energy of 33cm\textasciicircum{}-1 is observed. The results, when compared with those obtained for free-base porphin in the same glass, suggest that a low-frequency mode of TEA is responsible for the dephasing. From the experiments on micelles conclusions are drawn about the molecular confirmations of BChl-a in the detergent.",

author = "Thomas Schmidt and Smorenburg, \{H. E.\} and S. V{\"o}lker and \{van der Laan\}, H.",

year = "1992",

language = "English",

type = "Other",

}

TY - GEN

T1 - Permanent Hole-Burning with a Diode-Laser. Excited State Dynamics of Bacteriochlorophyll in Glasses and Micelles

AU - Schmidt, Thomas

AU - Smorenburg, H. E.

AU - Völker, S.

AU - van der Laan, H.

PY - 1992

Y1 - 1992

N2 - A temperature- and current-controlled diode laser at ~780nm was used to perform permanent hole-burning experiments on the S1<-S0 0-0 (Qy) transition of bacteriochlorophyll-a (BChl-a) in amorphous hosts. Hole widths were obtained for the glass triethylamine (TEA) between 0.4 and 15K, for micelles of the detergent lauryldimethylamine N-oxide (LDAO) between 1.2 and 4.2K, and for wet and dry CCl4 at 1.2K. The homogeneous linewidth, Ghom, of BChl-a in TEA follows a T^1.3 dependence at temperatures T<7K, wheras at T~7K a crossover to an exponential dependence with an activation energy of 33cm^-1 is observed. The results, when compared with those obtained for free-base porphin in the same glass, suggest that a low-frequency mode of TEA is responsible for the dephasing. From the experiments on micelles conclusions are drawn about the molecular confirmations of BChl-a in the detergent.

AB - A temperature- and current-controlled diode laser at ~780nm was used to perform permanent hole-burning experiments on the S1<-S0 0-0 (Qy) transition of bacteriochlorophyll-a (BChl-a) in amorphous hosts. Hole widths were obtained for the glass triethylamine (TEA) between 0.4 and 15K, for micelles of the detergent lauryldimethylamine N-oxide (LDAO) between 1.2 and 4.2K, and for wet and dry CCl4 at 1.2K. The homogeneous linewidth, Ghom, of BChl-a in TEA follows a T^1.3 dependence at temperatures T<7K, wheras at T~7K a crossover to an exponential dependence with an activation energy of 33cm^-1 is observed. The results, when compared with those obtained for free-base porphin in the same glass, suggest that a low-frequency mode of TEA is responsible for the dephasing. From the experiments on micelles conclusions are drawn about the molecular confirmations of BChl-a in the detergent.

M3 - Other contribution

ER -