Optical dephasing in free-base porphin in organic glasses: a study by photochemical hole-burning

Thijssen, H.P.H.; Dicker, A.I.M.; Völker, S.

doi:10.1016/0009-2614(82)83402-7

Cited by 98 publications

(26 citation statements)

References 27 publications

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“…Intramolecular photochemistry may be reversible [e.g. photoautomerism in free-base por phyrins (14,IS,(36)(37)(38)(39)(40)], or irreversible [e.g. photodissociation of dimethyl s-tetrazine (13) and s-tetrazine (35)].…”

Section: Mechanismsmentioning

confidence: 99%

“…Nevertheless, in order to understand what is involved in the experiments, I include a schematic diagram of a PHB and NPBH arrangement in Figure 2 as used in Refs. (39,51,66). The sample, immersed in liquid helium, is irradiated with a single-frequency cw dye laser (jitter � 2 MHz) pumped by an Ar+ -ion laser.…”

Section: Techniquesmentioning

confidence: 99%

“…A systematic hole-burning study of organic amorphous systems was started in the author's group in 1982 (39) with the aim of resolving the contradictions reported in the literature until then. The fi rst molecule /' "" " :9 � investigated was free-base porphin (H2P), because of its well-known behavior in crystalline hosts.…”

Section: Organic Molecules In Organic Glassesmentioning

confidence: 99%

“…The fi rst molecule /' "" " :9 � investigated was free-base porphin (H2P), because of its well-known behavior in crystalline hosts. Hole-burning experiments between 1.2 and 4.2K (39,40,66), and later down to 0.3K (43,76,77) and up to 20K (76), were performed on the S I <-So 0-0 transition in a large variety of glasses and polymers. In strong contrast to the data reported by other groups, the following results were found: (a) narrow holes of about hundreds of MHz to a few GHz at T � 2K; (b) the value ofrhom = �rhole (at very low burning fl uences) did extrapolate to the fluorescence lifetime-limited value, ro � 10 MHz of H2P, when T � 0; (c) rhom -rO followed a TJ.3-temperature law, independent of the organic amorphous host used.…”

Section: Organic Molecules In Organic Glassesmentioning

confidence: 99%

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Hole-Burning Spectroscopy

Völker¹

1989

Annu. Rev. Phys. Chem.

225

103

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Section: Mechanismsmentioning

confidence: 99%

Section: Techniquesmentioning

confidence: 99%

Section: Organic Molecules In Organic Glassesmentioning

confidence: 99%

Section: Organic Molecules In Organic Glassesmentioning

confidence: 99%

See 2 more Smart Citations

Hole-Burning Spectroscopy

Völker¹

1989

Annu. Rev. Phys. Chem.

225

103

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“…As the name implies, photochemical hole burning typically involves a reversible or irreversible photochemical reaction such as the electron transfer in RC of photosynthetic bacteria [133,134], PS n [135][136][137]. Within PHB one can distinguish between intramolecular photochemical reactions, taking place inside the guest molecule [138][139][140][141], or intermolecular ones occurring between the guest and the host [142][143][144]. In the former group, photochemistry may be reversible in the sense that irradiation into the photoproduct fills the hole and reconstitutes the original spectrum, or may be irreversible.…”

Section: Principles Of Spectral Hole Burningmentioning

confidence: 99%

High resolution fluorescence studies of metabolic pathways of DNA and oligonucleotide adducts from polycyclic aromatic compounds

Jeong

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UMI MICROFILMED 1991 INFORMATION TO USERSThis manuscript has been reproduced from the microfflm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are reproduced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book.Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality 6" x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order. 1991Signature was redacted for privacy.Signature was redacted for privacy.Signature was redacted for privacy.ii Ultraviolet and X-ray light have long beeHxknown to be highly cancer-causing and mutagenic agents [16]. For example, exposure of skin to UV light can induce skin cancer, while X-ray exposure to the thyroid induces thyroid cancer. Electromagnetic radiation, however, may not be assumed to cause all the cells in an exposed population to become cancerous since radiation can also produce many other deleterious changes leading to cell death. A radiation dose sufficient to induce cancer in all cells will virtually kill every cell. Not only can radiation induce simple mutation, it can also produce chromosome fragmentation, resulting in large deletions of genetic material. Thus radiation causes a variety of genetic changes, many of which might contribute to the cancerous state. A well known deleterious effect, xeroderma pigmentosum, is magnified in certain individuals. These people are homozygous for a recessive mutation that inactivates a gene involved in repairing thymine dimers, the major damage caused by UV Similar studies have shown that relatively weak carcinogens are also metabolized by monooxgenation mechanism. In most cases, however, the evidence is much less complete than in the case of B[a]P and rests primarily on comparison of the relative mutagenicities and tumorigenicities of the isomeric dihydrodiols or the corresponding diol epoxides obtained through synthesis. One-electron oxidation and metabolitesThe monooxygenation mechanism, which emphasizes the important role of the bay-region diol epoxide, has been widely accepted during last 15 years...

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Spectral Jumps of Single Molecules

Brown¹,

Orrit²

1996

Single‐Molecule Optical Detection, Imaging and Spectroscopy

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Optical dephasing in free-base porphin in organic glasses: a study by photochemical hole-burning

Cited by 98 publications

References 27 publications

Hole-Burning Spectroscopy

Hole-Burning Spectroscopy

High resolution fluorescence studies of metabolic pathways of DNA and oligonucleotide adducts from polycyclic aromatic compounds

Spectral Jumps of Single Molecules

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