Isotopically selective IR multiphoton dissociation of 1,3,5-trioxane

Churakov, V. V.; Fuß, Werner

doi:10.1007/bf01081126

Cited by 3 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such a mechanism of anharmonicity compensation requires that the amount of energy absorbed by the dimer is sufficient for dissociation of the dimer and excitation of at least one of its monomers. The dissociation energy of formic acid dimers varies from 12 to 15 kcal/mol . For the dimer having absorbed 4, 5, 6, and 7 quanta of irradiation, calculations using RRKM theory predict that the lifetimes will be 5, 0.7, 0.23, and 0.1 ns, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…A very large body of experimental and theoretical work on infrared multiphoton dissociation (MPD) has been accomplished since such reactions were first described over 20 years ago. − Of that work, a substantial proportion is concerned with isotope-specific MPD. − Isotopic enrichment in the gas phase of small molecules has been accomplished for sulfur, − oxygen, − hydrogen, − silicon 24 and multiple elements from the same compound. − The most extensive work has been done on carbon isotopes and most often with CO 2 lasers. − Carbon istotopic enrichment has been observed in single-wavelength, single-component reactants, − multiple-wavelength (usually two or more CO 2 laser lines) conditions 28-30 and in two-component, two-step processes. − …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiphoton Isotope-Selective Dissociation of Formic Acid Molecules under Action of a Free Electron Laser

et al. 1997

View full text Add to dashboard Cite

The infrared multiphoton dissociation (IR MPD) of formic acid molecules (HCOOH → CO + H2O) with free electron laser radiation in the 3 μm region (C−H stretch vibrational absorption band) and in the 6 μm region (CO stretch vibrational absorption band) has been achieved using the same laser. Results indicate that initial excitation of this dimer is more efficient for MPD then initial monomer excitation. Carbon isotope-selective MPD has been performed with an isotopic mixture, H12COOH + H13COOH (50% + 50%), at an irradiating wavelength of 5.56 μm. For this mixture, isotopic selectivity s = k 12/k 13 = 23 has been attained as a ratio of the rate constants of the H12COOH MPD and the H13COOH MPD, respectively. The isotopic selectivity for 13C in the naturally occurring mixture (1.1% of 13C-containing molecules) s = k 13/k 12 = 22 has been attained at an irradiating wavelength of 5.90 μm.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiphoton Isotope-Selective Dissociation of Formic Acid Molecules under Action of a Free Electron Laser

et al. 1997

View full text Add to dashboard Cite

show abstract

“…The intense band in ethers around 1000 cm -1 is ascribed to the antisymmetric stretching vibration of the C−O−C bond and expected to have a large oxygen isotope shift, although the shift has not been well-established in experiment. On the other hand, CO 2 laser-induced IRMPD of several ethers has been found to show large isotope effects between these oxygen isotopes. − The fact is suggestive of the large shift of the band around 1000 cm -1 . Previously, we have obtained very high selectivity on 18 O in the IRMPD of natural diisopropyl ether under selected irradiation conditions .…”

Section: Introductionmentioning

confidence: 99%

¹⁸O-Selective Infrared Multiple Photon Decomposition of Natural and ¹⁸O-Enriched Diisopropyl Ethers

1999

View full text Add to dashboard Cite

O-Selective infrared multiple photon decomposition of diisopropyl ether has been studied in detail using samples with 18 O at oxygen atomic fractions of 0.20% (natural abundance ratio), 4.5%, and 17.3%. The 1022 cm -1 band due to the 12 C-16 O-12 C antisymmetric stretching vibration was found to shift toward a lowenergy side by 24 cm -1 for 12 C-18 O-12 C. The 18 O-selectivities and yields of the main products containing oxygen, acetaldehyde, and 2-propanol were examined as functions of experimental parameters. The irradiation of a few Torr (1 Torr ) 1 mmHg ) 133.322 Pa) of diisopropyl ether with TEA (transversely excited atmospheric) CO 2 laser lines in the vicinity of 950 cm -1 resulted in considerably high enrichment of 18 O in the products. The fluence at focus was more or less than 8 J cm -2 . Acetaldehyde and 2-propanol containing 18 O at about 20% were obtained from natural ether, and those containing more than 70% were obtained from 17.3% 18 O-enriched ether. The observed results can be explained in term of the mechanism involving radical and molecular decomposition channels.

show abstract

Six-membered Rings with 1,2,4-Oxygen or Sulfur Atoms

Kleinpeter

2008

Comprehensive Heterocyclic Chemistry III

View full text Add to dashboard Cite

Isotopically selective IR multiphoton dissociation of 1,3,5-trioxane

Cited by 3 publications

References 35 publications

Multiphoton Isotope-Selective Dissociation of Formic Acid Molecules under Action of a Free Electron Laser

Multiphoton Isotope-Selective Dissociation of Formic Acid Molecules under Action of a Free Electron Laser

¹⁸O-Selective Infrared Multiple Photon Decomposition of Natural and ¹⁸O-Enriched Diisopropyl Ethers

Six-membered Rings with 1,2,4-Oxygen or Sulfur Atoms

Contact Info

Product

Resources

About

Isotopically selective IR multiphoton dissociation of 1,3,5-trioxane

Cited by 3 publications

References 35 publications

Multiphoton Isotope-Selective Dissociation of Formic Acid Molecules under Action of a Free Electron Laser

Multiphoton Isotope-Selective Dissociation of Formic Acid Molecules under Action of a Free Electron Laser

18O-Selective Infrared Multiple Photon Decomposition of Natural and 18O-Enriched Diisopropyl Ethers

Six-membered Rings with 1,2,4-Oxygen or Sulfur Atoms

Contact Info

Product

Resources

About

¹⁸O-Selective Infrared Multiple Photon Decomposition of Natural and ¹⁸O-Enriched Diisopropyl Ethers