The ground state of silylidene (H2C=Si), the silicon analog of vinylidene, from stimulated emission pumping and wavelength-resolved fluorescence spectroscopy

2001 ◽  
Vol 114 (20) ◽  
pp. 9012-9019 ◽  
Author(s):  
Tony C. Smith ◽  
Haiyang Li ◽  
Dennis J. Clouthier
Keyword(s):  
Fluorescence Spectroscopy ◽  
Ground State ◽  
Stimulated Emission ◽  
Silicon Analog

scholarly journals Fluorescent chemosensors for metal ions based on 3-(2-benzoxazol-5-yl)alanine skeleton

2010 ◽  
Vol 8 (3) ◽  
pp. 674-686 ◽  
Author(s):  
Magda Milewska ◽  
Katarzyna Guzow ◽  
Wiesław Wiczk
Keyword(s):  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Metal Ions ◽  
Ground State ◽  
Transition Metal Ions ◽  
Fluorescent Chemosensors ◽  
Time Resolved Fluorescence ◽  
Absorption Bands ◽  
Time Resolved ◽  
Ratiometric Sensors

AbstractThe ability of new chelate ligands, benzoxazol-5-yl-alanine derivatives substituted in position 2 by heteroaromatic substituent, to form complexes with selected metal ions in acetonitrile are studied by means of absorption and steady-state and time-resolved fluorescence spectroscopy. Among the ligands studied, only azaaromatic derivatives form stable complexes with transition metal ions in the ground state. Their absorption bands are bathochromically shifted enabling to use those ligands as ratiometric sensors. The fluorescence of each ligand is quenched by metal ions, however, in the presence of Cd(II) and Zn(II) ions a new red shifted emission band is observed.

Spectral and Photoprototropic Characteristics of 4-Aminobiphenyl in β-Cyclodextrin

2004 ◽  
Vol 69 (4) ◽  
pp. 748-758 ◽  
Author(s):  
Israel V. Muthu Vijayan Enoch ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Excited State ◽  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Inclusion Complex ◽  
Ground State ◽  
Time Resolved Fluorescence ◽  
Neutral Form ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

The photophysical and photoprototropic behaviour of 4-aminobiphenyl (4ABP) in aqueous β-cyclodextrin (β-CDx) solution has been investigated using steady-state and time-resolved fluorescence spectroscopy. Fluorescence of the neutral form of 4ABP is enhanced due to the formation of a 1:1 complex with β-CDx. The formation of this complex has been confirmed by time-resolved spectroscopy. In the presence of β-CDx, no change was observed in the ground state pKa value but the excited state pKa value changed. Based on its photophysical and photoprototropic characteristics in β-CDx, the structure of the 1:1 inclusion complex is proposed.

scholarly journals Singlet and Triplet Exciton Dynamics of Violanthrone

2021 ◽  
Author(s):  
Elham Gholizadeh ◽  
Shyamal Prasad ◽  
Lara Gillan ◽  
Dane R. McCamey ◽  
Murad J. Y. Tayebjee ◽  
...  
Keyword(s):  
Triplet State ◽  
Ground State ◽  
Density Functional ◽  
Transient Absorption ◽  
Density Functional Theory Calculations ◽  
Emission Feature ◽  
Stimulated Emission ◽  
Transient Absorption Spectrum ◽  
Exciton Dynamics ◽  
Solid Film

<div>The exciton dynamics of violanthrone-79 are investigated in solution and in the solid</div><div>state. In solution, the photo-prepared singlet is found to exhibit a strong ground-state bleach</div><div>and stimulated emission feature, but when sensitized in its triplet state, exhibits only a narrow</div><div>and weak ground-state bleach. As supported by density functional theory calculations,</div><div>this is explained by the triplet state having absorptions in the same region, with a similar</div><div>oscillator strength, as the ground state molecule. In solid films, the excited singlet is</div><div>found to survive only 100 ps, giving way to a long-lived transient absorption spectrum with</div><div>characteristics reminiscent of the triplet in solution. This is interpreted in terms of singlet</div><div>fission in the solid film.</div>

Laser‐induced Fluorescence Spectroscopy of CoS: Identification of a New Excited State Arising from the Ground State

2013 ◽  
Vol 26 (6) ◽  
pp. 701-704 ◽  
Author(s):  
Jian‐zheng Zang ◽  
Qun Zhang ◽  
De‐ping Zhang ◽  
Cheng‐bing Qin ◽  
Qiang Zhang ◽  
...  
Keyword(s):  
Excited State ◽  
Fluorescence Spectroscopy ◽  
Ground State ◽  
Laser Induced Fluorescence

Quenching of Silver Nanoparticles

2014 ◽  
Vol 781 ◽  
pp. 135-144 ◽  
Author(s):  
E. Thanikaivalan ◽  
R. Jothilakshmi
Keyword(s):  
Silver Nanoparticles ◽  
Optical Absorption ◽  
Fluorescence Quenching ◽  
Fluorescence Spectroscopy ◽  
Absorption Spectroscopy ◽  
Ground State ◽  
Fluorescence Emission ◽  
Quenching Of Fluorescence ◽  
Volmer Plot

Silver nanoparticles of different sizes have been prepared. Absorption spectroscopy reveals the formation of ground state complex. Fluorescence spectroscopy has been used to study the signatures of fluorescence quenching. Properties of N-(2-methylthiophenyl)-2-hydroxy-1-naphthaldimine (NMTHN) on silver nanoparticles has been investigated using optical absorption and fluorescence emission techniques. Quenching of fluorescence of N-(2-methylthiophenyl)-2-hydroxy-1-naphthaldimine has been found to decrease with increase in the size of the silver nanoparticles. The results of the quenching experiments were analyzed through Stern Volmer plot.

Sign in / Sign up

Export Citation Format

Share Document