Rotationally resolved fluorescence excitation spectra of jet-cooled pyrimidine and pyrimidine-argon van der Waals complex

1986 ◽  
Vol 90 (22) ◽  
pp. 5619-5622 ◽  
Author(s):  
Yoshiyuki Sugahara ◽  
Naohiko Mikami ◽  
Mitsuo Ito
Keyword(s):  
Van Der Waals ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Van Der Waals Complex ◽  
Fluorescence Excitation Spectra

scholarly journals Proton Tunneling In 5-Chlorotropolone-M1 (M = Kr, Xe, CH4) Van Der Waals Complexes

1995 ◽  
Vol 15 (2-4) ◽  
pp. 229-247
Author(s):  
Hiroshi Sekiya ◽  
Taiji Nakajima ◽  
Hidenori Hamabe ◽  
Akira Mori ◽  
Hitoshi Takeshita ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Proton Tunneling ◽  
Tunneling Splitting ◽  
Free Jet ◽  
Tunneling Splittings ◽  
Fluorescence Excitation Spectra ◽  
Intramolecular Motions

The S1-S0 fluorescence excitation spectra of 5-chlorotropolone-M1 (M = Kr, Xe, CH4) van der Waals (vdW) complexes in the region near the electronic origin have been measured in a supersonic free jet to investigate the effect of the vdW interactions on proton tunneling. Tunneling splittings have been observed in the vdW vibrations as well as in the 000 transitions of the Kr and Xe complexes. The 000 tunneling splitting of the 5-chlorotropolone-(CH4)1 complex is significantly smaller than those of the Kr and Xe complexes. It has been suggested that the vdW vibrations couple with intramolecular motions, leading to a higher potential energy barrier to tunneling in the CH4 complex. The results of the 5- chlorotropolone complexes have been compared to those of the tropolone complexes.

Shifts in fluorescence excitation spectra of anthracene-argon van der waals complexes

1985 ◽  
Vol 92 (2-3) ◽  
pp. 187-197 ◽  
Author(s):  
W.E. Henke ◽  
Yu Weijun ◽  
H.L. Selzle ◽  
E.W. Schlag ◽  
D. Wutz ◽  
...  
Keyword(s):  
Van Der Waals ◽  
Van Der Waals Complexes ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra

Laser-Induced Fluorescence Excitation Spectra oftert-Butoxy and 2-Butoxy Radicals

1999 ◽  
Vol 103 (41) ◽  
pp. 8207-8212 ◽  
Author(s):  
Chuji Wang ◽  
Liat G. Shemesh ◽  
Wei Deng ◽  
Michael D. Lilien ◽  
Theodore S. Dibble
Keyword(s):  
Laser Induced Fluorescence ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra

scholarly journals Single-Cell and Bulk Fluorescence Excitation Signatures of Seven Phytoplankton Species During Nitrogen Depletion and Resupply

2018 ◽  
Vol 73 (3) ◽  
pp. 304-312 ◽  
Author(s):  
Stefan T. Faulkner ◽  
Cameron M. Rekully ◽  
Eric M. Lachenmyer ◽  
Ergun Kara ◽  
Tammi L. Richardson ◽  
...  
Keyword(s):  
Single Cell ◽  
Aquatic Ecosystems ◽  
Single Cells ◽  
Vital Role ◽  
Phytoplankton Species ◽  
Nitrogen Depletion ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Fluorescence Excitation Spectra ◽  
Taxonomic Groups

Phytoplankton play a vital role as primary producers in aquatic ecosystems. One common approach to classifying phytoplankton is fluorescence excitation spectroscopy, which leverages the variation in types and concentrations of pigments among different phytoplankton taxonomic groups. Here, we used a fluorescence imaging photometer to measure excitation ratios (“signatures”) of single cells and bulk cultures of seven differently pigmented phytoplankton species as they progressed from nitrogen N-replete to N-depleted conditions. Our objective was to determine whether N depletion alters the fluorescence excitation signature of each species and, if so, how quickly they recover when N (as nitrate) was resupplied, because these factors affect our ability to classify the species correctly. Of the seven species studied, only Proteomonas sulcata, a marine cryptophyte, showed measurable changes in single-cell fluorescence excitation ratios and bulk fluorescence excitation spectra. These changes were likely due to decreases in the cellular concentration of phycoerythrin, a N-rich pigment, as N became scarce. Within 3 h of resupply of N, fluorescence signatures began returning to pre-depletion values and were indistinguishable from N-replete cells by 80 h after resupply. These data suggest that our classification approach is robust for non-PE containing phytoplankton. PE-containing phytoplankton might exhibit systematic changes in their signatures depending on their level of N depletion, but this could be detected and the phytoplankton re-classified following a few hours of incubation in N replete conditions.

Photoassociation due to electron transfer. Exciplex formation in non-polar solvent

1971 ◽  
Vol 24 (9) ◽  
pp. 1797 ◽  
Author(s):  
RJ McDonald ◽  
BK Selinger
Keyword(s):  
Polar Solvent ◽  
Excitation Energy Transfer ◽  
Acceptor Pair ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Exciplex Formation ◽  
Reversible Dissociation ◽  
Fluorescence Excitation Spectra ◽  
Donor Acceptor ◽  
Donor Acceptor Pair

Exciplexes may be formed by exciting either partner of a given electron donor-acceptor pair. As the formation of such exciplexes is reversible, dissociation may lead to excitation energy transfer. ��� The temperature dependence of fluorescence excitation spectra has proved to be a powerful tool for exploring these systems.

Sign in / Sign up

Export Citation Format

Share Document