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Topic: Intersystem crossing

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	Intersystem crossing agents for efficient utilization of excitons in organic light emitting devices - Patent 6310360
		wherein the heterostructure comprises an intersystem crossing molecule such that the efficiency of the emission is enhanced by the use of the intersystem crossing molecule.
		The device of claim 12 wherein the emissive molecule is fluorescent and the intersystem crossing agent is an organometallic compound comprising a metal of the third row of the periodic table.
		It is preferred that the emissive molecule and the intersystem crossing molecule be different and it is preferred that there be substantial spectral overlap between the emissive molecule and the intersystem crossing molecule.
	www.freepatentsonline.com /6310360.html (8668 words)

	An Investigation of the Solvent Dependence on the Ultrafast Intersystem Crossing Kinetics of Xanthone
		The kinetics of internal conversion and intersystem crossing of xanthone in solution are measured using femtosecond pump-probe techniques.
		The intersystem crossing rates from the ^1 \pi \pi^* and ^1 n \pi^* electronic states are consistent with an "inverse" gap effect where the rate constants increase as the singlet-triplet energy gap increases.
		The branching between intersystem crossing from the ^1 \pi \pi^* and ^1 n \pi^* electronic states is also highly solvent dependent and is determined by the rate of internal conversion in the singlet electronic state.
	flux.aps.org /meetings/YR97/BAPSMAR97/abs/S2902007.html (248 words)

	Intersystem crossing agents for efficient utilization of excitons in organic light emitting devices - Patent 6894307
		The device of claim 1, wherein the intersystem crossing agent is selected from the group consisting of acridines, acridones, brominated polycyclic aromatic compounds, anthraquinones, alpha-beta-diketones, phenazines, benzoquinones, biacetyls, fullerenes, thiophenes, pyrazines, quinoxalines and thianthrenes.
		The device of claim 2, wherein the intersystem crossing agent is a brominated polycyclic aromatic compound.
		an emissive layer between the anode and the cathode, wherein the emissive layer comprises a fluorescent emissive molecule and an intersystem crossing agent which transfers energy to the fluorescent emissive molecule, wherein the fluorescent emissive molecule exhibits fluorescence when a voltage is applied across the anode and the cathode.
	www.freepatentsonline.com /6894307.html (8392 words)

	Intersystem Crossing Rate Constants of Rhodamine Dyes (Site not responding. Last check: 2007-10-09)
		By using this technique we measured intersystem crossing rate constants of structural related rhodamine dyes.
		Although rhodamine dyes are distinguished by a very low probability of intersystem crossing the results can be presented with high accuracy.
		In contrast to the fluorescence quantum yield the rate constant of intersystem crossing is not influenced by the substitution of the amino groups.
	www.uni-siegen.de /~pci/thiel/e/literatur_2.htm (81 words)

	Reverse intersystem crossing in Rose Bengal. II. fluence dependence of fluorescence following 532 nm laser excitation ... (Site not responding. Last check: 2007-10-09)
		A fluence-dependent fluorescence technique was used to observe reverse intersystem crossing from a certain higher-lying triplet state of rose bengal populated by a single pulse of 532 nm light.
		The quantum yield of reverse intersystem crossing from this state was determined to be 0.12 +/- 0.02 for rose bengal in phosphate-buffered saline.
		The importance of including molecular rotation effects in the analysis of fluorescence resulting from reverse intersystem crossing is discussed.
	www.findarticles.com /p/articles/mi_qa3931/is_200203/ai_n9024323 (691 words)

	Variable-Temperature Studies of Laser-Initiated 5T2 1A1 Intersystem Crossing in Spin-Crossover Complexes: Empirical ...
		Intersystem Crossing in Spin-Crossover Complexes: Empirical Correlations between Activation Parameters and Ligand Structure in a Series of Polypyridyl Ferrous Complexes
		intersystem crossing is examined with variable-temperature laser-flash photolysis.
		intersystem crossing, as gauged by the preexponential term, is a function of how far along the reaction coordinate a complex proceeds.
	pubs.acs.org /cgi-bin/abstract.cgi/inocaj/1996/35/i07/abs/ic9507880.html (511 words)

	oe magazine - Single-Molecule Magic (Site not responding. Last check: 2007-10-09)
		The molecule may also undergo intersystem crossing from S1 into a triplet state (T1) from which it can then return to the ground state at rate kT.
		The intersystem crossing rate (kISC) and triplet decay rate (kT) are shown with gray arrows.
		Obtaining the largest possible signal from the molecule requires a combination of factors, including a large absorption cross section, high fluorescence quantum yield, and a weak bottleneck into dark states such as triplet states.
	oemagazine.com /FromtheMagazine/jun04/feature.html (1530 words)

	Dr. Nayif Masoud (Site not responding. Last check: 2007-10-09)
		N. Masoud "Room Temperature Intersystem Crossing Quantum Yield of Quinoline in Methanol", Garyounis Scientific Bulletin, 7, 1 (1983).
		N. Masoud "Determination of the Intersystem Crossing Quantum Yield of Quinoline in Methanol and Ethanol at Room Temperature", The First Basic Sciences Conference, Tripoli, Libya, 1989.
		N. Masoud "Determination the Room Temperature Intersystem Crossing Quantum Yield of Quinoline in Alcoholic Solvents", J.
	www.hu.edu.jo /chemistry/nayif.htm (109 words)

	EPR Studies
		While some have been detected in low-temperature matrices, direct detection of 1,4-cyclohexadiyl and related biradicals has been unsuccessful due to their low stability and fast intersystem crossing rates.
		The goal of this research is to detect and characterize these biradicals in single crystals by EPR spectroscopy.
		Therefore, various aspects of their energetics and structure such as "through bond" and "through space" coupling, structural and substituent effects on singlet-triplet energy gaps and on intersystem crossing (ISC) rates are of particular interest.
	wwwnew.towson.edu /physics/reu/EPR.htm (528 words)

	Jablonski Diagram (Site not responding. Last check: 2007-10-09)
		Three nonradiative deactivation processes are also significant here: internal conversion (IC), intersystem crossing (ISC) and vibrational relaxation.
		Internal conversion is the radiationless transition between energy states of the same spin state (compare with fluorescence-a radiative process).
		Intersystem crossing is a radiationless transition between different spin states (compare to phosphorescence).
	www.shsu.edu /~chemistry/chemiluminescence/JABLONSKI.html (318 words)

	Reverse intersystem crossing from a triplet state of rose bengal populated by sequential 532- + 1064-nm laser ... (Site not responding. Last check: 2007-10-09)
		Reverse intersystem crossing from a triplet state of rose bengal populated by sequential 532- + 1064-nm laser excitation.
		The photophysical parameters describing the high-lying triplet populated by the two-step, two-color excitation were determined from fits of a model of the kinetics to the experimental data.
		Based on this analysis T_2 has a reverse intersystem crossing quantum yield of 0.0142 \pm 0.0003 and a lifetime of 5.8 \pm 1.6 ps.
	flux.aps.org /meetings/YR99/CENT99/abs/S2025004.html (233 words)

	Amazon.com: "intersystem crossing time": Key Phrase page (Site not responding. Last check: 2007-10-09)
		TST is the intersystem 10 crossing time from S, - To, LOTS is the intersystem crossing time from To -+ So, the a values are the absorption cross sections (in W/cm2).
		For pulses shorter than the intersystem crossing time, singlet state absorption will dominate, for increasing pulse length the triplet state, where the excited molecules accumulate due to its...
		Triplet excitons are found to have a single absorption band; intersystem crossing time from the singlet to the triplet manifolds is estimated to be --4 ns in films and -20 ns in solutions.
	www.amazon.com /phrase/intersystem-crossing-time (583 words)

	Olympus FluoView Resource Center: Glossary of Terms in Confocal Microscopy
		Intersystem crossing between singlet and triplet states is depicted by diagonal straight or wavy lines.
		In general, photobleaching occurs when the fluorochrome undergoes intersystem crossing from an excited singlet to a triplet state.
		Molecules in the triplet state are easily modified by complex chemical reactions with adjacent molecules or oxygen.
	www.olympusfluoview.com /theory/glossary.html (10049 words)

	Role of Intersystem Crossing in the Dynamics of the O(3P)+ICl, CF3I Reactions
		Role of Intersystem Crossing in the Dynamics of the O(3P)+ICl, CF3I Reactions
		Role of Intersystem Crossing in the Dynamics of the O(ICl, CF I Reactions
		This attributed to efficient intersystem crossing from the lowest triplet potential energy surface to form a persistent OIR complex on the under- lying singlet potential energy surface in each case.
	www.chem.leeds.ac.uk /conferences/abstracts/wells.html (170 words)

	Jablonski diagram - Wikipedia, the free encyclopedia
		A second type of nonradiative transition is internal conversion (ic), which occurs when a vibrational state of an electronically excited state can couple to a vibrational state of a lower electronic state.
		A third type is intersystem crossing (isc); this is a transition to a state with a different spin multiplicity.
		In molecules with large spin-orbit coupling, intersystem crossing is much more important than in molecules that exhibit only small spin-orbit coupling.
	en.wikipedia.org /wiki/Jablonski_diagram (287 words)

	Olympus Microscopy Resource Center: Fluorescence - Jablonski Energy Diagram - Interactive Java Tutorial
		Both of the triplet state transitions are diagrammed on the right-hand side of the Jablonski energy profile illustrated in Figure 1.
		The low probability of intersystem crossing arises from the fact that molecules must first undergo spin conversion to produce unpaired electrons, an unfavorable process.
		Molecules containing heavy atoms, such as the halogens and many transition metals, often facilitate intersystem crossing and are frequently phosphorescent.
	www.olympusmicro.com /primer/java/jablonski/jabintro (1562 words)

	Chapter 1
		However as the intersystem crossing occurred, this shows that spin-orbit coupling is sufficient to partially break down the singlet-triplet selection rules, making the transition weakly 'allowed'.
		The rate constant for the reverse intersystem crossing may then be estimated from the intercept.
		This all occurs within a few nanoseconds of irradiation, and as a result, it is possible to study the triplet excited states of molecules which have near zero intersystem crossing efficiencies, without the need to use a sensitiser.
	chemistry.mtu.edu /~pcharles/RESEARCH/thesis/ch01/HomePage.html (7611 words)

	UV-Vis Luminescence Spectroscopy - Theory
		The spin of an excited electron can be reversed, leaving the molecule in an excited triplet state; this is called intersystem crossing.
		It can then undergo a second intersystem crossing to a high vibrational level of the electronic ground state.
		A molecule in the excited triplet state may not always use intersystem crossing to return to the ground state.
	teaching.shu.ac.uk /hwb/chemistry/tutorials/molspec/lumin1.htm (712 words)

	CROSS (Site not responding. Last check: 2007-10-09)
		In other words, the lowest energy intersystem crossing geometry is generated.
		, in which case the states n and n-1 will be used in the intersystem crossing.
		Consider the decomposition of 1,2-dioxetane into two molecules of formaldehyde, in which the crossing point wanted involves a singlet and a triplet state having the same energy.
	www.cachesoftware.com /mopac/Mopac2002manual/node142.html (915 words)

	Wanda K. Hartmann (Site not responding. Last check: 2007-10-09)
		A supramolecular assembly is a group of molecules held together by intramolecular forces that performs a specific function, in our case triggering an optical signal.
		The work that I have been doing can be divided into two categories, absorption intersystem crossing emission (AICE) and absorption energy transfer emission (AETE).
		The sensing mechanism of the alcohol sensor is based on decreasing the oxygen quenching rate constant (kq) of a phosphor, 1-bromonaphthalene (1-BrNp) thereby allowing intersystem crossing from the singlet to the triplet state.
	www.cem.msu.edu /~kingjere/wanda.html (356 words)

	Amazon.com: "intersystem crossing": Key Phrase page (Site not responding. Last check: 2007-10-09)
		All time-dependent processes starting at this excited electronic state (emission, radiati- onless deactivation, intersystem crossing to other electronic configurations) are concurrent to the photochemical process.
		Conversion probabilities (toF, quantum yield of fluorescence 4,, quantum yield of phosphorescence jT quantum yield of intersystem crossing (triplet state formation) 4 quantum yield of cis-trans photoisomerization 4 quantum yield of trans-cis isomerization 'r1 (...
		The spin- imposed barrier for triplet to singlet intersystem crossing (ISC) separates primary and secondary bond formation in time.
	www.amazon.com /phrase/intersystem-crossing (527 words)

	III-M-6 (Site not responding. Last check: 2007-10-09)
		III-M-6 Detection of Metastable Triplet Acetylene Produced by Intersystem Crossing from the Excited A(u
		Triplet metastable species produced by intersystem crossing from the A(
		The lifetimes of triplet states produced by intersystem crossing from the V
	ns.ims.ac.jp /publications/ann_rev_97/iii-m-6.html (135 words)

	Mathies People: Template
		My research is focused on exploring ultrafast dynamics of electronically excited molecules.
		Femtosecond stimulated Raman spectroscopy (FSRS) developed in this group allows us to probe vast range of dynamic events occurring in the electronic excited states such as internal conversion, intersystem crossing, and photochemical reactions (e.g.
		Soo-Ying Lee(2), to intersystem crossing dynamics of metal-to-ligand charge transfer states (MLCT) of Ruthenium polypyridyl complexes(3), and to the isomerization dynamics of biologi
	www.cchem.berkeley.edu /~ramgrp/alpha/people/Alumni/sangwoon/index.html (187 words)

	Spin-Orbit Coupling and Intersystem Crossing in Conjugated Polymers: A Configuration Interaction Description (Site not responding. Last check: 2007-10-09)
		Intersystem crossing from the singlet to the triplet manifold is made possible by spin-orbit coupling, which leads to a mixing of the singlet (S
		matrix elements, obtained from first-order perturbation theory, are used to compute the rates of intersystem crossing from the lowest singlet excited state, S
		On the basis of these results, a general mechanism is proposed to describe the intersystem crossing process in conjugated oligomers and polymers.
	pubs.acs.org /cgi-bin/abstract.cgi/jpcafh/2001/105/i15/abs/jp010187w.html (179 words)

	intersystem - OneLook Dictionary Search (Site not responding. Last check: 2007-10-09)
		We found one dictionary with English definitions that includes the word intersystem:
		Tip: Click on the first link on a line below to go directly to a page where "intersystem" is defined.
		intersystem : Merriam-Webster's Online Dictionary, 10th Edition [home, info]
	www.onelook.com /?w=intersystem (69 words)

	Hydrocarbon "metabolism"
		Following these additions the butadiyne moiety would be well controlled positionally, and we could remove the two hydrogens by applying two hydrogen abstraction tools.
		If both radicals have the same spin then the obvious closed-shell electronic structure for the product requires an intersystem crossing.
		To ensure that this takes place rapidly and reliably, Drexler proposed that a "heavy" atom should be in the vicinity of the reaction.
	www.zyvex.com /nanotech/hydroCarbonMetabolism.html (7669 words)

	Intersystem crossing and spin-orbit coupling in alkene triplets and triplet biradicals (Site not responding. Last check: 2007-10-09)
		Intersystem crossing and spin-orbit coupling in alkene triplets and triplet biradicals
		Download the Document (PDF format - 4.4 MB) - December 2005
		Send your questions or comments to: Library Web Oversight Committee
	epublish.utdallas.edu /theses/13159 (190 words)

	(WO/2001/008230) INTERSYSTEM CROSSING AGENTS FOR EFFICIENT UTILIZATION OF EXCITONS IN ORGANIC LIGHT EMITTING DEVICES (Site not responding. Last check: 2007-10-09)
		(WO/2001/008230) INTERSYSTEM CROSSING AGENTS FOR EFFICIENT UTILIZATION OF EXCITONS IN ORGANIC LIGHT EMITTING DEVICES
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	www.wipo.int /pctdb/en/wo.jsp?KEY=01/08230.010201 (223 words)

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