scholarly journals Mechanistic insights into two-photon-driven photocatalysis in organic synthesis

2018 ◽  
Vol 20 (12) ◽  
pp. 8071-8076 ◽  
Author(s):  
Marianna Marchini ◽  
Andrea Gualandi ◽  
Luca Mengozzi ◽  
Paola Franchi ◽  
Marco Lucarini ◽  
...  
Keyword(s):  
Excited States ◽  
Organic Synthesis ◽  
Two Photon ◽  
Short Lifetime ◽  
Sequential Absorption ◽  
Better Than

Is two-photon catalysis better than one-photon? The sequential absorption of two photons enables the production of highly reducing or oxidizing species. The short lifetime of the excited states and the photostability of the photocatalyst pose significant limitations to this approach.

scholarly journals Highly accurate transition frequencies in the H2 Lyman and Werner absorption bands

2004 ◽  
Vol 82 (6) ◽  
pp. 713-722 ◽  
Author(s):  
J Philip ◽  
J P Sprengers ◽  
Th. Pielage ◽  
C A de Lange ◽  
W Ubachs ◽  
...  
Keyword(s):  
Molecular Spectroscopy ◽  
Spectral Lines ◽  
Laser Source ◽  
Special Focus ◽  
Absorption Bands ◽  
Two Photon ◽  
Extreme Uv ◽  
Photon Ionization ◽  
Vacuum Uv ◽  
Better Than

The transition frequencies of low-J excitation lines in the B1Σu+– X1Σg+,(ν′,0) Lyman bands have been measured for ν′ = 2–18 and in the C1Πu–X1Σg+,(ν′,0) Werner bands for ν′ = 0–4, using a narrow-band tunable extreme UV laser source at wavelengths λ = 92–105 nm in conjunction with the technique of 1 +  1′ two-photon ionization. The measurements can be divided into three categories for which varying absolute accuracies were obtained. Special focus was on the B, ν′ = 2–5 bands, where an accuracy of 0.004 cm–1 or δv/v = 4 x 10–8 is achieved. For transitions to B, ν′ ≤ 13 and C, ν′ ≤ 3 states the accuracy is 0.005 cm–1 or δv/v = 5 x 10–8. Due to a different frequency mixing scheme uncertainties for B, ν′ ≥ 13 and C, ν′ = 4 are at the level of 0.011 cm–1 or δv/v = 1.1 x 10–7. Inspection of combination differences between R(J) and P(J + 2) lines shows that the accuracies are even better than estimated in the error budget. Based on the measurements of 138 spectral lines and the known combination differences, transition frequencies of 60 P-lines could be calculated as well, so that a data base of 198 accurately calibrated lines results for the Lyman and Werner bands of H2. Key words: vacuum UV, molecular spectroscopy, hydrogen, precision metrology.

Fluorescence anisotropy in indole under two-photon excitation in the spectral range 385–510 nm

2018 ◽  
Vol 20 (30) ◽  
pp. 19922-19931 ◽  
Author(s):  
M. E. Sasin ◽  
A. G. Smolin ◽  
K.-H. Gericke ◽  
E. Tokunaga ◽  
O. S. Vasyutinskii
Keyword(s):  
Propylene Glycol ◽  
Excited States ◽  
Spectral Range ◽  
Ground State ◽  
Fluorescence Anisotropy ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Excitation ◽  
Molecular Ground State

This paper presents the detailed study of two-photon excited fluorescence in indole dissolved in propylene glycol produced by two-photon absorption from the molecular ground state to several high lying excited states.

scholarly journals Stark-effect study of excited states in sodium using two-photon spectroscopy

1977 ◽  
Vol 15 (3) ◽  
pp. 967-974 ◽  
Author(s):  
R. T. Hawkins ◽  
W. T. Hill ◽  
F. V. Kowalski ◽  
A. L. Schawlow ◽  
S. Svanberg
Keyword(s):  
Excited States ◽  
Stark Effect ◽  
Effect Study ◽  
Two Photon

Excited States and Two-Photon Absorption of Some Novel Thiophenyl Pt(II)−Ethynyl Derivatives

2007 ◽  
Vol 111 (2) ◽  
pp. 244-250 ◽  
Author(s):  
Eirik Glimsdal ◽  
Marcus Carlsson ◽  
Bertil Eliasson ◽  
Boris Minaev ◽  
Mikael Lindgren
Keyword(s):  
Excited States ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon
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