Dissociation of methanol in intense femtosecond laser field

Tang, Xiaoping; Gao, Lirong; Wang, Yonglin; Wang, Cao; Wang, Sufan; Kong, Fanzuo

doi:10.1360/02tb9428

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…Double ionization of methanol has attracted considerable attention because it induces a variety of reactions that are generally observed for larger organic molecules and may yield interstellar molecular ions such as H + 3 . Various methods of double ionization have been used, including vacuum UV photoionization (PI; photons from 30.5 to 48.4 eV) [1,2], fs laser ionization [3][4][5], electron impact (EI; 1.3 keV [6], 30-200 eV [7]), and ion impact with high energy (1.2 MeV [8,9]) and low energy (120 keV [10]). The first systematic study of the fragmentation of methanol dications was reported by Eland and coworkers, who employed PI for double ionization [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The use of ultrafast lasers is an efficient multiple-ionization method, but the ionization scheme is quite different from single-photon or electron-impact ionization. Thus, it provides different information from the double ionization of methanol [3][4][5]. A notable finding was the ultrafast H migration revealed by angular distribution of the fragment ions.…”

Section: Introductionmentioning

confidence: 99%

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Dissociation of methanol dications produced by electron capture with and without transfer ionization

Hayakawa¹,

Mastumoto²,

Shiromaru³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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Double ionization and subsequent ion-pair dissociation induced by low-energy collisions of Ar 8+ were studied for various methanol isotopomers to understand how the reactions of transient methanol dications correlate with the charge states of the scattered ions. Single-hit time-of-flight (TOF) spectra of recoil ions excluding multi-hit events show that long-lived molecular dications always correlate with Ar 7+ scattered ions, indicating that they are formed only by double-capture collisions that accompany transfer ionization. The double-hit TOF measurements of fragment ions show that the branching ratios of CH/OH cleaving largely depend on the charge states of scattered ions. The H/D substitution effect on the hydrogen migration indicates that a concerted motion of atoms is essential for this reaction pathway.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dissociation of methanol dications produced by electron capture with and without transfer ionization

Hayakawa¹,

Mastumoto²,

Shiromaru³

et al. 2011

J. Phys. B: At. Mol. Opt. Phys.

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“…The photodissociation of methanol in the gas phase has been studied experimentally and theoretically in the ultraviolet region by several authors (Shi et al 2002;Tang et al 2002;Zavilopulo 2005). However, despite some photoabsorption studies in the X-ray range (Ishii & Hitchcook 1988;Prince et al 2003;Burton et al 1992) there are few studies focusing on the photodissociation pathways in this photon energy range.…”

Section: Introductionmentioning

confidence: 99%

Photodissociation of organic molecules in star-forming regions

Pilling

Neves

Santos

et al. 2006

A&A

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The presence of methyl alcohol or methanol (CH 3 OH) in several astrophysical environments has been characterized by its high abundance that depends on both the production rate and the destruction rate. In the present work, the photoionization and photodissociation processes of methanol have been experimentally studied, employing soft X-ray photons (100-310 eV) from a toroidal grating monochromator (TGM) beamline of the Brazilian Synchrotron Light Laboratory (LNLS). Mass spectra were obtained using the photoelectron photoion coincidence (PEPICO) method. Kinetic energy distribution and abundances for each ionic fragment have been obtained from the analysis of the corresponding peak shapes in the mass spectra. Absolute photoionization and photodissociation cross sections were also determined. We have found, among the channels leading to ionization, about 11-16% of CH 3 OH survive the soft X-rays photons. This behavior, together with an efficient formation pathways, may be associated with the high column density observed in star-forming regions. The three main photodissociation pathways are represented by COH + (or HCO + ) ion release (with ejection of H 2 + H), the dissociation via C-O bond rupture (with strong charge retention preferentially on the methyl fragment) and the ejection of a single energetic (2-4 eV) proton. Since methanol is very abundant in star forming regions, the produced protons could be an alternative route to molecular hydrogenation or a trigger for secondary dissociation processes or even to promote extra heating of the environment.

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Low temperature reactive dyeing of silk: An investigation into dyeing conditions, and strength loss and friction damage of fabric

Jiang,

Tang

2024

Journal of Industrial and Engineering Chemistry

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Dissociation of methanol in intense femtosecond laser field

Cited by 3 publications

References 23 publications

Dissociation of methanol dications produced by electron capture with and without transfer ionization

Dissociation of methanol dications produced by electron capture with and without transfer ionization

Photodissociation of organic molecules in star-forming regions

Low temperature reactive dyeing of silk: An investigation into dyeing conditions, and strength loss and friction damage of fabric

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