Temperature shifts in the optical spectra of solvated electrons in methanol and ethanol

1972 ◽  
Vol 76 (25) ◽  
pp. 3876-3883 ◽  
Author(s):  
K. N. Jha ◽  
G. L. Bolton ◽  
G. R. Freeman
Keyword(s):  
Optical Spectra ◽  
Solvated Electrons

Resolution of optical spectra of solvated electrons in water

1980 ◽  
Vol 84 (19) ◽  
pp. 2457-2458 ◽  
Author(s):  
T. R. Tuttle ◽  
Sidney Golden
Keyword(s):  
Optical Spectra ◽  
Solvated Electrons

Shapes of optical spectra of solvated electrons. Effect of pressure

1977 ◽  
Vol 81 (9) ◽  
pp. 909-915 ◽  
Author(s):  
Fang-Yuan Jou ◽  
Gordon R. Freeman
Keyword(s):  
Optical Spectra ◽  
Solvated Electrons ◽  
Effect Of Pressure

Photoredox Reactions of Iodo Iron(III) Complexes Containing Tetradentate Ligands

2001 ◽  
Vol 66 (1) ◽  
pp. 109-118 ◽  
Author(s):  
Jozef Šima ◽  
Dáša Lauková ◽  
Vlasta Brezová
Keyword(s):  
Schiff Bases ◽  
Spin Trapping ◽  
Molar Ratio ◽  
Oh Radicals ◽  
Solvated Electrons ◽  
Open Chain ◽  
Tetradentate Ligands ◽  
Visible Irradiation ◽  
Epr Spin Trapping ◽  
Spin Trapping Technique

Photoredox reactions occurring in irradiated methanolic solutions of trans-[FeIII(R,R'-salen)(CH3OH)I], where R,R'-salen2- are N,N'-ethylenebis(R,R'-salicylideneiminato), tetradentate open-chain N2O2-Schiff bases with R,R' = H, 5-Cl, 5-Br, 3,5-di-Br, 3,5-di-(CH3), 3-OCH3, 5-OCH3, have been investigated and their mechanism proposed. The complexes are redox-stable in the dark. Ultraviolet and/or visible irradiation of methanolic solution of the complexes induces photoreduction of Fe(III) to Fe(II). Depending on the composition of the irradiated solutions, •CH2OH radicals or solvated electrons were identified by the EPR spin trapping technique. The final product of the photooxidation coupled with the photoreduction of Fe(III) is formaldehyde and the molar ratio of Fe(II) and CH2O is close to 2 : 1. The efficiency of the photoredox process is strongly wavelength-dependent and influenced by the peripheral groups R,R' of the tetradentate ligands.

Optical Spectra, EPR, and Spin–Lattice Relaxation of Yb3+ Ions in Crystals Having Perovskite-Type Structure

1977 ◽  
Vol 81 (1) ◽  
pp. 287-293 ◽  
Author(s):  
A. A. Antipin ◽  
A. V. Vinokurov ◽  
M. P. Davydova ◽  
S. L. Korableva ◽  
A. L. Stolov ◽  
...  
Keyword(s):  
Lattice Relaxation ◽  
Optical Spectra ◽  
Type Structure ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Perovskite Type ◽  
Perovskite Type Structure

scholarly journals Characterization of M dwarfs using optical mid-resolution spectra for exploration of small exoplanets

2020 ◽  
Author(s):  
Yohei Koizumi ◽  
Masayuki Kuzuhara ◽  
Masashi Omiya ◽  
Teruyuki Hirano ◽  
John Wisniewski ◽  
...  
Keyword(s):  
Sample Selection ◽  
Optical Spectra ◽  
Average Error ◽  
Spectral Energy ◽  
M Dwarfs ◽  
Energy Distributions ◽  
Fitting Procedures ◽  
Optical Region ◽  
Selection For

Abstract We present the optical spectra of 338 nearby M dwarfs, and compute their spectral types, effective temperatures (Teff), and radii. Our spectra were obtained using several optical spectrometers with spectral resolutions that range from 1200 to 10000. As many as 97% of the observed M-type dwarfs have a spectral type of M3–M6, with a typical error of 0.4 subtype, among which the spectral types M4–M5 are the most common. We infer the Teff of our sample by fitting our spectra with theoretical spectra from the PHOENIX model. Our inferred Teff is calibrated with the optical spectra of M dwarfs whose Teff have been well determined with the calibrations that are supported by previous interferometric observations. Our fitting procedures utilize the VO absorption band (7320–7570 Å) and the optical region (5000–8000 Å), yielding typical errors of 128 K (VO band) and 85 K (optical region). We also determine the radii of our sample from their spectral energy distributions. We find most of our sample stars have radii of <0.6 R⊙, with the average error being 3%. Our catalog enables efficient sample selection for exoplanet surveys around nearby M-type dwarfs.

scholarly journals Aggregates of polar dyes: beyond the exciton model

2021 ◽  
Vol 23 (14) ◽  
pp. 8282-8291
Author(s):  
Mattia Anzola ◽  
Anna Painelli
Keyword(s):  
Degrees Of Freedom ◽  
Optical Spectra ◽  
Exciton Model

Optical spectra of aggregates of polar dyes are discussed, fully accounting for polarizability of the dyes and for the coupling of electronic and vibrational degrees of freedom.

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