One- and two-photon detachment of the negative chlorine ion

Trainham, R.; Fletcher, G. D.; Larson, D. J.

doi:10.1088/0022-3700/20/23/002

Cited by 114 publications

(47 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The thresholds measured by comparing the s-wave Wigner law to the zerofield detachment data are within error of the thresholds determined by using the calibration results and the accepted values for the electron affinities [22,23].…”

Section: Modelsupporting

confidence: 56%

s-wave photodetachment in a static electric field

1993

View full text Add to dashboard Cite

Photodetachmentfrom negative ions in a static electric field has been studied using Cl and S These experiments were done with greater precision than previous studies and allow a quantitative comparison of data with theory. A 10-keV ion beam was sent through a region with fields of up to 1.5 kV/cm applied parallel to the beam velocity. A pulsed dye-laser beam, perpendicular to the ion beam, photoneutralized the ions. The relative cross sections were measured by detecting the resulting fast neutral atoms. Detachment below threshold and oscillations on the cross section above threshold were observed near the S threshold at 16269.5 cm ' and near the Cl threshold at 29138.3 cm '. The phase of the oscillations in the data is in good agreement with predictions for s-wave photodetachment in a static electric field, but the amplitude of the oscillations is found to be slightly reduced.PACS number(s): 32.80.Fb, 32.60.+i

show abstract

Section: Modelsupporting

confidence: 56%

s-wave photodetachment in a static electric field

1993

View full text Add to dashboard Cite

show abstract

“…Reaction 13: (Klein & Steinmetz, 1975) (Cumming & Kebarle, 1978), while that of HCl is 1395 kJ/mol (Trainham, Fletcher, & Larson, 1987). This means that CF 3 COOH needs less enthalpy to undergo deprotonation, and therefore it is a stronger acid in the gas-phase than HCl.…”

Section: Probe Gasesmentioning

confidence: 99%

Characterization of surface functional groups present on laboratory-generated and ambient aerosol particles by means of heterogeneous titration reactions

Setyan

Sauvain

Riediker

et al. 2009

Journal of Aerosol Science

View full text Add to dashboard Cite

A Knudsen flow reactor has been used to quantify surface functional groups on aerosols collected in the field. This technique is based on a heterogeneous titration reaction between a probe gas and a specific functional group on the particle surface. In the first part of this work, the reactivity of different probe gases on laboratory-generated aerosols (limonene SOA, Pb(NO 3 ) 2 , Cd(NO 3 ) 2 ) and diesel reference soot (SRM 2975) has been studied. Five probe gases have been selected for the quantitative determination of important functional groups: N(CH 3 ) 3 (for the titration of acidic sites), NH 2 OH (for carbonyl functions), CF 3 COOH and HCl (for basic sites of different strength), and O 3 (for oxidizable groups). The second part describes a field campaign that has been undertaken in several bus depots in Switzerland, where ambient fine and ultrafine particles were collected on suitable filters and quantitatively investigated using the Knudsen flow reactor. Results point to important differences in the surface reactivity of ambient particles, depending on the sampling site and season. The particle surface appears to be multi-functional, with the simultaneous presence of antagonistic functional groups which do not undergo internal chemical reactions, such as acid-base neutralization. Results also indicate that the surface of ambient particles was characterized by a high density of carbonyl functions (reactivity towards NH 2 OH probe in the range 0.26-6 formal molecular monolayers) and a low density of acidic sites (reactivity towards N(CH 3 ) 3 probe in the range 0.01-0.20 formal molecular monolayer). Kinetic parameters point to fast redox reactions (uptake coefficient 0 > 10 −3 for O 3 probe) and slow acid-base reactions ( 0 < 10 −4 for N(CH 3 ) 3 probe) on the particle surface.

show abstract

“…Experimental interest in negative ions burgeoned only at the end of the 1980s, when a number of measurements (mostly, for negative halide ions) were performed in the perturbative laser intensity regime: in 1987 Trainham et al [55] measured the two-photon detachment cross section for Cl − , and beginning in 1989, a number of other groups carried out measurements of two-and three-photon cross sections for other ions [56][57][58][59][60]. In 1990, Blondel et al [61] measured the first multiphoton detachment ADs (for two-and three-photon detachment of Br − ).…”

Section: Status Of Multiphoton Detachment Of Negative Ionsmentioning

confidence: 99%

Multiphoton detachment of a negative ion by an elliptically polarized, monochromatic laser field

Manakov

Frolov

Borca

et al. 2003

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

View full text Add to dashboard Cite

The quasistationary quasienergy state approach (QQES) is applied to the analysis of partial (n-photon) decay rates and angular distributions (ADs) of photoelectrons produced by an elliptically polarized laser field. The problem is formulated for a weakly bound electron with an energy E 0 in the threedimensional δ-model potential (which approximates the short-range potential of a negative ion) interacting with a strong monochromatic laser field having an electric vector F (ωt). The results presented cover weak (perturbative), strong (nonperturbative), and superstrong field regimes as well as a wide interval of frequencies ω extending from the tunnelling (hω |E 0 |) and multiphoton (hω < |E 0 |) cases up to the high frequency domain (hω > |E 0 |).For a weak laser field, exact equations for the normalization factor and for the Fourier coefficients of the QQES wavefunction at the origin (|r| → 0) (that are key elements of the QQES approach for a δ-model potential) as well as for the detachment amplitudes are analysed analytically using both standard RayleighSchrödinger perturbation theory (PT) in the intensity, I , of the laser field and Brillouin-Wigner PT expansions involving the exact (complex) quasienergy . The lowest-order perturbative results for the n-photon ADs are presented in analytic form, and the parametrization of ADs in terms of polarization-and angular-independent atomic parameters is discussed for the general case of elliptical polarization. The major emphasis is on the analysis of an ellipticity induced distortion of three-dimensional ADs and, especially, on the elliptic dichroism (ED) effect, i.e. the dependence of the photoelectron yield in a fixed direction n on the sign of the ellipticity (or on the helicity) of a laser field. The dominant role of binding potential effects for a correct description of ED and threshold effects is demonstrated, and the intimate relationship between atomic ED factors and scattering phases of the detached electron is established for multiphoton detachment, including the above-threshold case. For a strong laser field, we present an accurate derivation for the QQES wavefunction and decay rates in the Keldysh approximation (KA) from exact QQES equations, including analytical, first-order ('rescattering') corrections to the KA results. The symmetries of ADs and the existence of ED are established using the exact analytical result for the n-photon detachment amplitude. Accurate numerical results are presented for the variation of the structure of the ADs as well as of the ED effect with increasing laser intensity.For the high frequency case,hω > |E 0 |, a rigorous analytical treatment of higher-order PT effects is presented for one-photon detachment, taking into account corrections of higher orders in I to the well-known photodetachment cross section for a short-range potential. Together with the exact numerical analysis of the total and partial decay rates forhω > |E 0 |, these results demonstrate the existence of a quasistationary stabilization regime in the de...

show abstract

One- and two-photon detachment of the negative chlorine ion

Cited by 114 publications

References 30 publications

s-wave photodetachment in a static electric field

s-wave photodetachment in a static electric field

Characterization of surface functional groups present on laboratory-generated and ambient aerosol particles by means of heterogeneous titration reactions

Multiphoton detachment of a negative ion by an elliptically polarized, monochromatic laser field

Contact Info

Product

Resources

About