Photothermal spectroscopy of bacteriochlorophyll-lipoprotein complexes.
Photoacoustic spectra at room and 85 K temperatures as well as photothermal beam deflection spectra of bacteriochlorophyll-lipoprotein complexes from purple bacterium Chromatium minutissimum were measured. Spectra were compared and obtained differences were tentatively explained by various inertion of these two methods. Photothermal beam deflection method measure the heat which is generated in close surroundings of absorbing pigment molecule, whereas usage of more inert photoacoustic signal is averaged over contributions from various pigments located in a larger sample volume and therefore is similar to absorption spectra.
Frackowiak
D
D
Institute of Physics, Poznań Technical University, Poland.
Cegielski
R
R
Abdourakhmanov
I
I
Leblanc
R M
RM
D001429:Bacteriochlorophylls / Q000737:chemistry / Q000378:metabolism*; D002844:Chromatium / Q000378:metabolism*; D008074:Lipoproteins / Q000737:chemistry / Q000378:metabolism*; D010777:Photochemistry; D013053:Spectrophotometry; D013816:Thermodynamics
D001429:Bacteriochlorophylls; D008074:Lipoproteins