Resonance-enhanced multiphoton ionisation spectroscopy of methanethiol

Morgan, R.E.; Puyuelo, P.; Howe, Jonathan D.; Ashfold, Michael N. R.; Wales, N. P. L.; Lange, CA De

doi:10.1039/ft9959102715

Cited by 14 publications

(13 citation statements)

References 20 publications

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“…As amply demonstrated in previous studies, [32][33][34][35][36] this approach has unique advantages over the commonly employed approach of mass-resolved ion detection, since in general it allows the unambiguous identification of the ͑ro͒vibronic character of the excited state from which ionization took place. Put in another way, one might say that the projection of the wave function of the excited state on the ionic manifold, as done in the photoionization step, ultimately enables the reconstruction of this wave function.…”

Section: Introductionmentioning

confidence: 99%

Vibronic coupling in excited states of acetone

Steege

Wirtz

2002

The Journal of Chemical Physics

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Photoelectron spectroscopy of Rydberg states of acetone-h 6 and -d 6 populated by two-or three-photon excitation has been employed to unravel the vibronic description of excited-state levels. For the 3p Rydberg states vibronic transitions have been reanalyzed, leading to various reassignments and the observation of hitherto nonreported transitions. In addition, several ionic vibrational frequencies could be determined. At higher excitation energies previously identified, and in the present study newly identified, members of two Rydberg series have been characterized. The ns Rydberg series was explored up to the 8s state, the nd series up to the 7d state. Based upon the unambiguous assignments of vibronic character that we obtain for excited-state levels, various valence-Rydberg and Rydberg-Rydberg vibronic coupling pathways come to light and are analyzed.

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Section: Introductionmentioning

confidence: 99%

Vibronic coupling in excited states of acetone

Steege

Wirtz

2002

The Journal of Chemical Physics

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“…Two experimental cross sections (Vaghjiani 1993;Tokue et al 1987) were combined to describe CH 3 SH photoabsorption from its long-wavelength threshold at 330 nm (Wilson et al 1994) to the ionisation threshold at 131 nm (Morgan et al 1995). For shorter wavelengths, a photodissociation cross section linearly extrapolated to zero at 100 nm (30 nm below the ionisation threshold) was adopted, and a photoionisation cross section using the measured efficiency for CH 3 SH + production of Kutina et al (1982) after scaling its maximum value to 5 × 10 −18 cm 2 .…”

Section: Ch 3 Sh -Methanethiolmentioning

confidence: 99%

Photodissociation and photoionisation of atoms and molecules of astrophysical interest

Heays

Bosman

Dishoeck

2017

A&A

432

442

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A new collection of photodissociation and photoionisation cross sections for 102 atoms and molecules of astrochemical interest has been assembled, along with a brief review of the basic physical processes involved. These have been used to calculate dissociation and ionisation rates, with uncertainties, in a standard ultraviolet interstellar radiation field (ISRF) and for other wavelength-dependent radiation fields, including cool stellar and solar radiation, Lyman-α dominated radiation, and a cosmic-ray induced ultraviolet flux. The new ISRF rates generally agree within 30% with our previous compilations, with a few notable exceptions. Comparison with other databases such as PHIDRATES is made. The reduction of rates in shielded regions was calculated as a function of dust, molecular and atomic hydrogen, atomic C, and self-shielding column densities. The relative importance of these shielding types depends on the atom or molecule in question and the assumed dust optical properties. All of the new data are publicly available from the Leiden photodissociation and ionisation database. Sensitivity of the calculated rates to variation of temperature and isotope, and uncertainties in measured or calculated cross sections, are tested and discussed. Tests were conducted on the new rates with an interstellar-cloud chemical model, and find general agreement (within a factor of two) in abundances obtained with the previous iteration of the Leiden database assuming an ISRF, and order-of-magnitude variations assuming various kinds of stellar radiation. The newly parameterised dust-shielding factors makes a factor-of-two difference to many atomic and molecular abundances relative to parameters currently in the UDfA and KIDA astrochemical reaction databases. The newly-calculated cosmic-ray induced photodissociation and ionisation rates differ from current standard values up to a factor of 5. Under high temperature and cosmic-ray-flux conditions the new rates alter the equilibrium abundances of abundant dark cloud abundances by up to a factor of two. The partial cross sections for H 2 O and NH 3 photodissociation forming OH, O, NH 2 and NH are also evaluated and lead to radiation-field-dependent branching ratios.

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“…In this way, a photoelectron spectrum recorded for ionization via higher-lying Rydberg states allows the direct observation of many lower-lying Rydberg states. 25,26 For instance, the photoelectron spectrum displayed in Fig. 5 shows a large part of the ͓X 2 ⌸ 3/2 ͔ns series.…”

mentioning

confidence: 99%

“…25,26 A prototypical example is shown in Fig. 5, which displays the photoelectron spectrum obtained for ionization via the ͓X 2 ⌸ 3/2 ͔11s(vЈϭ0) Rydberg state.…”

mentioning

confidence: 99%

Resonance-enhanced multiphoton ionization photoelectron spectroscopy of Rydberg states of N2O below the X 2Π ionization limit

Scheper

Kuijt

Lange

1998

The Journal of Chemical Physics

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Resonance-enhanced multiphoton ionization photoelectron spectroscopy of Rydberg states of N2O below the X ionization limit Scheper, C.R.; Kuijt, J.; Buma, W.J.; de Lange, C.A. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. A three-photon resonance-enhanced multiphoton ionization spectroscopic study on N 2 O is carried out in the spectral range from 80 000 cm Ϫ1 up to the lowest ionization limit at 103 963 cm Ϫ1. High-resolution photoelectron spectroscopy is used to identify and characterize the observed excited states. Eighteen origins are reported which have either not been assigned before or are reassigned now. Moreover, the photoelectron spectra taken at higher-lying resonances often show extensive vibronic coupling with the near-resonant vibronic manifolds built on lower-lying origins.

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Resonance-enhanced multiphoton ionisation spectroscopy of methanethiol

Cited by 14 publications

References 20 publications

Vibronic coupling in excited states of acetone

Vibronic coupling in excited states of acetone

Photodissociation and photoionisation of atoms and molecules of astrophysical interest

Resonance-enhanced multiphoton ionization photoelectron spectroscopy of Rydberg states of N2O below the X 2Π ionization limit

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