𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Picosecond time-resolved S2→S0 fluorescence of xanthione in different fluid solvents

✍ Scribed by Co-Jen Ho; Andrea L. Motyka; Michael R. Topp

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
702 KB
Volume
158
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

✦ Synopsis

Time-correlated single-photon counting experiments at 2 25 ps resolution have been used to measure the S, fluorescence decay time of xanthione in different fluid solvents. Systematic differences in Sz lifetime in the range 20-30 ps are revealed for a homologous series of n-alkane solvents, and an increase in lifetime for extensive chain branching is also noted. Solutions of xanthione in aromatic solvents and in alcohols arc found to exhibit fluorescence decay times < 20 ps. Little evidence is seen which would support a nonradiative relaxation mechanism involving Franck-Condon sclcctive cncrgy transfer to high-energy vibrational modes ofthe solvent. Instead, the current results provide support for a mechanism in which a rcvcrsiblc solvent-solute chemical reaction, probably involving bond insertion, is responsible for the solvent dependence ofthe SL fluorescence decay time.

📜 SIMILAR VOLUMES

Picosecond time resolution of the S2 flu
Picosecond time resolution of the S2 fluorescence of jet-cooled xanthione
✍ Stacey A. Wittmeyer; Andrew J. Kaziska; Maria I. Shchuka; Andrea L. Motyka; Mich 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 619 KB

The fluorescence lifetime of the SI electronic level of xanthione has been measured under supersonic jet conditions to be 345 I! 10 ps. Fluorescence lifetimes ranging from 240 to 370 ps were also measured, following excitation into different SL vibrational levels. This confirms that, in addition to

Origins of the differences in solvation
Origins of the differences in solvation by alkanes and perfluoroalkanes: Evidence from the S2-S0 spectra of jet-cooled van der Waals complexes of xanthione and azulene
✍ H.K. Sinha; O.K. Abou-Zied; M. Ludwiczak; A. Maciejewski; R.P. Steer 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 753 KB

The S& fluorescence excitation spectra of xanthione (XT) and azulene (AZ) complexed with 1 or 2 molecules of the C, to Cl0 n-alkanes and the C, to C, perfluoro-n-alkanes have been measured. The 1: I complexes exhibit microscopic solvent shifts, A& which are larger for the alkanes than the correspond

Investigation of the molecular chemilumi
Investigation of the molecular chemiluminescence SrCl(A2Π1/2,3/2, B2Σ+ → X2Σ+) and the atomic resonance fluorescence Sr(53P1 → 51S0) in the time-domain following the pulsed dye laser generation of Sr(53 PJ) in the presence of CH2Cl2
✍ S. Antrobus; D. Husain; Jie Lei; F. Castaño; M. N. Sanchez Rayo 📂 Article 📅 1995 🏛 John Wiley and Sons 🌐 English ⚖ 996 KB

## Abstract Time‐resolved investigations of the atomic resonance fluorescence Sr(5^3^P~1~ → 5^1^S~0~) and the molecular chemiluminescence from SrCl(A^2^Π~1/2,3/2~, B^2^Σ^+^ → X^2^Σ^+^) are reported following the reaction of the electronically excited strontium atom, Sr(5s5p(^3^P~J~)), 1.807 eV abov