Two-color photoionization of naphthalene and benzene at threshold

Duncan, M. A.; Dietz, T. G.; Smalley, R. E.

doi:10.1063/1.442315

Cited by 171 publications

(54 citation statements)

References 25 publications

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“…The typical ionization energy is 2 . Similar observations have been reported by Smalley and coworkers [31] for benzene and anthracene. The ionization potential of toluene is 8.82 eV [29].…”

Section: Discussionsupporting

confidence: 91%

Intracluster Proton‐Transfer between Methylsubstituted Benzene Cations and Polar Solvent Molecules Studied by Resonant Two‐Photon Ionization

Brutschy

Janes

Eggert

1988

Ber Bunsenges Phys Chem

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Intraclustcr proton-transfc~was~bserved for mixed clusters of toluene and p-xylene with polar solvent molecules (NH 3 , CH 30H, 0 20) after~esonant two-photon IOmza~lOn.of the aromatic moiety. The transfer is deduced from the appearance of protonated solvent clusters, showing the R2PI spectra of their mixed cluster precursors. This process, observable only in combination with subsequent dissociation is cluster size dependent. The minimum number of solvent molecules necessary for a transfer to take place depends on the solvent's proton solvation energy.

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“…The typical ionization energy is 2 . Similar observations have been reported by Smalley and coworkers [31] for benzene and anthracene. The ionization potential of toluene is 8.82 eV [29].…”

Section: Discussionsupporting

confidence: 91%

Intracluster Proton‐Transfer between Methylsubstituted Benzene Cations and Polar Solvent Molecules Studied by Resonant Two‐Photon Ionization

Brutschy

Janes

Eggert

1988

Ber Bunsenges Phys Chem

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“…Since there is very little change in the geometry of the CsHi ion from that of the 51 or Tt states, the Franck-Condon factors will favor t:.v = 0 transitions. 23 For the vibrationless level of the 51 state, the ionization threshold will exhibit a sharp, step-function behavior at the energy (8.82 eV) corresponding to the adiabatic ionization potential I. P. (see Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

Time evolution studies of triplet toluene by two-color photoionization

Dietz¹,

Duncan²,

Smalley³

1982

The Journal of Chemical Physics

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Rovibronically selected and resolved two-color laser photoionization and photoelectron study of cobalt carbide cation J. Chem. Phys. 138, 094301 (2013); 10.1063/1.4790707Rovibronically selected and resolved two-color laser photoionization and photoelectron study of nickel carbide cation J. Chem. Phys. 133, 054310 (2010); 10.1063/1.3464488Twocolor photoionization of naphthalene and benzene at threshold Two-color photoionization has been applied to measurement of the time evolution of laser-excited IB ,(mr*) vibronic levels of toluene, The observed photoionization signals exhibit a biexponential dependence upon the time delay between the pump and ionizing lasers, This photon intensity is shown to be proportional to the population of the excited singlet (SI) and triplet (Tt) electronic states, The data is fit to a simple kinetic model which yields the rates of S I fluorescent decay, S I Tt, and Tt v··SJ intersystem crossings. The measured quantum yield for intersystem crossing was found to agree with previous work. The triplet lifetimes measured are considerably shorter than values reported for collisionally relaxed triplet states due to the steep excess vibrational energy dependence of the nonradiative rate. This excess energy dependence of the triplet decay rate has been measured over a limited range of energy and the observed rates are found not to extrapolate smoothly to the decay rate measured for the vibrationless T I level. This behavior is rationalized as a dilution of excitation in good accepting modes for the T SJ transition due to increasing dominance of lower frequency, poor accepting modes in the triplet density of states.

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“…81 The Stark shift on the adiabatic ionization energy (∆AIE) induced by the dc field (E f ) was calculated using the relation of ∆AIE = 6.1E f 1/2 , where E f is in V cm −1 and ∆AIE is in cm −1 . 82 The density functional theory (DFT) method with the B3LYP hybrid functional 83 was used to calculate the equilibrium geometries and vibrational frequencies of La(C 5 H 8 ), La(C 2 H 2 ), and the free ligands. The basis sets used in these calculations were 6-311+G(d,p) 84 for C and H and the Stuttgart/Dresden (SDD) 85 effective-core-potential basis set with 28-electron core for La.…”

Section: Experimental and Computational Methodsmentioning

confidence: 99%

Spectroscopy and formation of lanthanum-hydrocarbon radicals formed by C—H and C—C bond activation of 1-pentene and 2-pentene

Cao

Zhang

Nyambo

et al. 2018

The Journal of Chemical Physics

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La atom reactions with 1-pentene and 2-pentene are carried out in a laser-vaporization molecular beam source. The two reactions yield the same metal-hydrocarbon products from the dehydrogenation and carbon-carbon bond cleavage of the pentene molecules. The dehydrogenated species La(CH) is the major product, whereas the carbon-carbon bond cleaved species La(CH) and La(CH) are the minor ones. La(CH) is also observed and is presumably formed by La(CH) addition to a second pentene molecule. La(CH) and La(CH) are characterized with mass-analyzed threshold ionization (MATI) spectroscopy and quantum chemical computations. The MATI spectra of each species from the two reactions exhibit the same transitions. Adiabatic ionization energies and metal-ligand stretching frequencies are determined for the two species, and additional methyl bending and torsional frequencies are measured for the larger one. Five possible isomers are considered for La(CH), and a C metallacyclopentene (Iso A) is identified as the most possible isomer. La(CH) is confirmed to be a C metallacyclopropene. The ground electronic state of each species is a doublet with a La 6s-based electron configuration, and ionization yields a singlet state. The formation of the lanthanacyclopentene includes La addition to the C=C double bond, La insertion into two C(sp)-H bonds, and concerted dehydrogenation. For the 2-pentene reaction, the formation of the five-membered ring may also involve 2-pentene to 1-pentene isomerization. In addition to the metal addition and insertion, the formation of the three-membered metallacycle from 1-pentene includes C(sp)-C(sp) bond breakage and hydrogen migration from La to C(sp), whereas its formation from 2-pentene may involve the ligand isomerization.

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Two-color photoionization of naphthalene and benzene at threshold

Cited by 171 publications

References 25 publications

Intracluster Proton‐Transfer between Methylsubstituted Benzene Cations and Polar Solvent Molecules Studied by Resonant Two‐Photon Ionization

Intracluster Proton‐Transfer between Methylsubstituted Benzene Cations and Polar Solvent Molecules Studied by Resonant Two‐Photon Ionization

Time evolution studies of triplet toluene by two-color photoionization

Spectroscopy and formation of lanthanum-hydrocarbon radicals formed by C—H and C—C bond activation of 1-pentene and 2-pentene

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