The natural constituents of historical textile dyes

Ferreira, Ester S.B.; Hulme, Alison N.; McNab, Hamish; Quye, Anita

doi:10.1039/b305697j

Cited by 348 publications

(248 citation statements)

References 24 publications

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“…Higher order anisotropy parameters are approximately zero. The broad feature between 1.1 < eKE < 2.8 eV has the overall appearance of multi-photon absorption and the negative 30 anisotropy is consistent with that observed using 2-photon resonance enhanced detachment (Fig. 4(a)).…”

Section: High Intensity Effects: Observation Of Strong-field Ionisationsupporting

confidence: 86%

“…4(b). We note that similar emission has been observed in dianions studied by our group 31 and the Wang group 18 and have 30 been interpreted in a broadly similar manner.…”

Section: Effect Of Pulse Duration On Pe Anisotropy: Nanosecond Vs Fesupporting

confidence: 84%

“…4(a) shows the PE spectrum of InC 2-taken at 2.3 eV (538 nm), with a laser intensity below the onset of strong field effects (I fs ~1×10 10 W cm -2 ). The overall shape of the PE spectrum is consistent with that observed 30 at 4.7 eV, assuming the absorption of 2-photons (a single photon at 2.3 eV is below the adiabatic detachment energy of InC 2-). Specifically, the RCB cut-off at low eKE is clearly visible and at high eKE, the PE spectrum is consistent with the absorption of 2 photons.…”

Section: Effect Of Resonance-enhancement On Pe Imagessupporting

confidence: 83%

“…6(b). Based on simple electrostatic arguments, the Coulomb interaction between the two SO 3 -groups 30 is approximately 0.9 eV. This will lead to an RCB that is similar to that in the xy-plane for detachment from the HOMO.…”

Section: High Intensity Effects: Observation Of Strong-field Ionisationmentioning

confidence: 99%

“…In the case of molecular detachment, a complete description of the PAD becomes more challenging, but not impossible, and various aspects of PADs have been recently discussed in excellent reviews. [4][5][6][7][8] For both neutrals and anions, 30 the PE experiences a radially attractive potential. For neutrals, this is simply a charge-charge -1/r interaction.…”

Section: Introductionmentioning

confidence: 99%

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Effects of resonant excitation, pulse duration and intensity on photoelectron imaging of a dianion

Chatterley

Horke

Verlet

2014

Phys. Chem. Chem. Phys.

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. (2014) 'E ects of resonant excitation, pulse duration and intensity on photoelectron imaging of a dianion.', Physical chemistry chemical physics., 16 (2). pp. 489-496. Further information on publisher's website:http://dx.doi.org/10.1039/c3cp53235fPublisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The photoelectron imaging of the indigo carmine dianion is used to demonstrate the effects of resonance excitation, pulse duration and pulse intensity on the photoelectron spectra and angular distributions of a dianion. Excitation of the S 1 state leads to an aligned distribution of excited state dianions. The photoelectron angular distribution following subsequent photodetachment within a femtosecond laser pulse is primarily determined by the repulsive Coulomb barrier. Extending the timescale for 10 photodetachment to nanoseconds leads to dramatic changes in both the spectra and angular distributions. These observations are explained in terms of statistical detachment of electrons, either from the monoanion, or from the ground state of the dianion following a number of photon cycles trough the S 1 ← S 0 transition. At high intensity, new electron emission channels open up, leading to emission below the repulsive Coulomb barrier. This has been assigned to strong-field induced detachment and the effect of an 15 electric field on the Coulomb barrier is discussed in terms of the photoelectron spectra and angular distributions.

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Section: High Intensity Effects: Observation Of Strong-field Ionisationsupporting

confidence: 86%

“…4(b). We note that similar emission has been observed in dianions studied by our group 31 and the Wang group 18 and have 30 been interpreted in a broadly similar manner.…”

Section: Effect Of Pulse Duration On Pe Anisotropy: Nanosecond Vs Fesupporting

confidence: 84%

Section: Effect Of Resonance-enhancement On Pe Imagessupporting

confidence: 83%

Section: High Intensity Effects: Observation Of Strong-field Ionisationmentioning

confidence: 99%