Erratum: “Pressure and temperature dependence of the melt segmental dynamics of cis-1,4-polyisoprene via time resolved optical spectroscopy” [J. Chem. Phys. 117, 7774 (2002)]

2003 ◽  
Vol 118 (11) ◽  
pp. 5268-5268
Author(s):  
B. J. Punchard ◽  
D. B. Adolf
Keyword(s):  
Temperature Dependence ◽  
Optical Spectroscopy ◽  
Chem Phys ◽  
Segmental Dynamics ◽  
Time Resolved

scholarly journals Ultrafast proton release reaction and primary photochemistry of phycocyanobilin in solution observed with fs-time-resolved mid-IR and UV/Vis spectroscopy

2021 ◽  
Author(s):  
Maximilian Theiß ◽  
Merten Grupe ◽  
Tilman Lamparter ◽  
Maria Andrea Mroginski ◽  
Rolf Diller
Keyword(s):  
Density Functional ◽  
Transient Absorption ◽  
Vibrational Analysis ◽  
Density Functional Theory Calculations ◽  
Chem Phys ◽  
Molecular Structures ◽  
Ir Absorption ◽  
Time Resolved ◽  
Time Constants ◽  
Vis Spectroscopy

AbstractDeactivation processes of photoexcited (λex = 580 nm) phycocyanobilin (PCB) in methanol were investigated by means of UV/Vis and mid-IR femtosecond (fs) transient absorption (TA) as well as static fluorescence spectroscopy, supported by density-functional-theory calculations of three relevant ground state conformers, PCBA, PCBB and PCBC, their relative electronic state energies and normal mode vibrational analysis. UV/Vis fs-TA reveals time constants of 2.0, 18 and 67 ps, describing decay of PCBB*, of PCBA* and thermal re-equilibration of PCBA, PCBB and PCBC, respectively, in line with the model by Dietzek et al. (Chem Phys Lett 515:163, 2011) and predecessors. Significant substantiation and extension of this model is achieved first via mid-IR fs-TA, i.e. identification of molecular structures and their dynamics, with time constants of 2.6, 21 and 40 ps, respectively. Second, transient IR continuum absorption (CA) is observed in the region above 1755 cm−1 (CA1) and between 1550 and 1450 cm−1 (CA2), indicative for the IR absorption of highly polarizable protons in hydrogen bonding networks (X–H…Y). This allows to characterize chromophore protonation/deprotonation processes, associated with the electronic and structural dynamics, on a molecular level. The PCB photocycle is suggested to be closed via a long living (> 1 ns), PCBC-like (i.e. deprotonated), fluorescent species.

Photophysical properties of N719 and Z907 dyes, benchmark sensitizers for dye-sensitized solar cells, at room and low temperature

2021 ◽  
Vol 23 (10) ◽  
pp. 6182-6189
Author(s):  
Dariusz M. Niedzwiedzki
Keyword(s):  
Solar Cells ◽  
Low Temperature ◽  
Optical Spectroscopy ◽  
Room Temperature ◽  
Photophysical Properties ◽  
Dye Sensitized Solar Cells ◽  
Time Resolved ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Photophysical properties of N719 and Z907, benchmark Ru-dyes used as sensitizers in dye-sensitized solar cells, were studied by static and time-resolved optical spectroscopy at room temperature and 160 K.

Temperature dependence of time-resolved photoluminescence of bound excitons in CuInS2 crystals

2005 ◽  
Vol 480-481 ◽  
pp. 283-285 ◽  
Author(s):  
K. Wakita ◽  
K. Nishi ◽  
Y. Ohta ◽  
T. Onishi
Keyword(s):  
Temperature Dependence ◽  
Time Resolved ◽  
Time Resolved Photoluminescence

scholarly journals Dynamics of Anomalous Temperature-Induced Emission Shift in MOCVD-grown (Al, In)GaN Thin Films

2000 ◽  
Vol 5 (S1) ◽  
pp. 796-802 ◽  
Author(s):  
Yong-Hoon Cho ◽  
G. H. Gainer ◽  
J. B. Lam ◽  
J. J. Song ◽  
W Yang ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Stokes Shift ◽  
Energy Shift ◽  
Peak Position ◽  
Time Resolved ◽  
Temperature Range ◽  
Al Content ◽  
Peak Energy ◽  
Emission Behavior ◽  
Pl Intensity

We present a comprehensive study of the optical characteristics of (Al, In)GaN epilayers measured by photoluminescence (PL), integrated PL intensity, and time-resolved PL spectroscopy. For not only InGaN, but also AlGaN epilayers with large Al content, we observed an anomalous PL temperature dependence: (i) an “S-shaped” PL peak energy shift (decrease-increase-decrease) and (ii) an “inverted S-shaped” full width at half maximum (FWHM) change (increase-decrease-increase) with increasing temperature. Based on time-resolved PL, the S shape (inverted S shape) of the PL peak position (FWHM) as a function of temperature, and the much smaller PL intensity decrease in the temperature range showing the anomalous emission behavior, we conclude that strong localization of carriers occurs in InGaN and even in AlGaN with rather high Al content. We observed that the following increase with increasing Al content in AlGaN epilayers: (i) a Stokes shift between the PL peak energy and the absorption edge, (ii) a redshift of the emission with decay time, (iii) the deviations of the PL peak energy, FWHM, and PL intensity from their typical temperature dependence, and (iv) the corresponding temperature range of the anomalous emission behavior. This indicates that the band-gap fluctuation responsible for these characteristics is due to energy tail states caused by non-random inhomogeneous alloy potential variations enhanced with increasing Al content.

scholarly journals Polarization-resolved broadband time-resolved optical spectroscopy for complex materials: application to the case of MoTe2 polytypes

2020 ◽  
Vol 28 (6) ◽  
pp. 8819
Author(s):  
Michele Perlangeli ◽  
Simone Peli ◽  
Davide Soranzio ◽  
Denny Puntel ◽  
Fulvio Parmigiani ◽  
...  
Keyword(s):  
Optical Spectroscopy ◽  
Complex Materials ◽  
Time Resolved

scholarly journals Monitoring radiofrequency ablation of biological tissue using broadband time-resolved diffuse optical spectroscopy

2019 ◽  
Author(s):  
Pranav Lanka ◽  
Francis Kalloor Joseph ◽  
Hindrik Kruit ◽  
Sanathana Konugolu Venkata Sekar ◽  
Andrea Farina ◽  
...  
Keyword(s):  
Radiofrequency Ablation ◽  
Optical Spectroscopy ◽  
Biological Tissue ◽  
Time Resolved ◽  
Diffuse Optical Spectroscopy

Scattering delay time of Mie scatterers determined from steady-state and time-resolved optical spectroscopy

2000 ◽  
Vol 17 (4) ◽  
pp. 745
Author(s):  
Stefan Willmann ◽  
Albert Terenji ◽  
Harald Busse ◽  
Ilya V. Yaroslavsky ◽  
Anna N. Yaroslavsky ◽  
...  
Keyword(s):  
Steady State ◽  
Optical Spectroscopy ◽  
Delay Time ◽  
Time Resolved
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