zhao_2020

X. Zhao, X. Yu, X. Xu, Z. Yin, J. Yu, X. Li, P. Ma, D. Zhang, C. Wang, S. Luo and D. Ding, “Ultrafast dissociation dynamics of singly and doubly ionized N2O in strong laser fields”, Phys. Rev. A 101, 013416 (2020)

Source record · Catalogue · Review register

DOI: 10.1103/PhysRevA.101.013416

Source kind: measurement

Recorded technique: Strong-field pump-probe Coulomb explosion imaging of N2O in a COLTRIMS: an 800 nm, ~35 fs, 1 kHz pump, linear, 1.0 x 10^14 W/cm2, and an elliptical probe (epsilon ~ 0.7, 3.5 x 10^14 W/cm2), roles exchanged at negative delay; delays -2 to 6 ps in 33.3 fs steps, cross-correlation 90 fs FWHM. Only the three-body channel N2O3+ -> N+ + N+ + O+ is analysed (momentum-sum condition < 3 a.u.) (p. 2).

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

PRA 101, 013416, pages 013416-1 to -7 = pdf pages 1-7. Identity checked on pdf page 1 (title, authors, journal line, DOI). The same group and apparatus as zhao_2023, which takes the two-body channels and gives their KERs.

WHY NO DATASETS (TC-970). Every KER printed here is the Coulomb-explosion energy of the triply charged ion the probe makes, a probe of the geometry at the delay, not the energy released by a dissociation of the pulse’s products: - the KER bands (p. 2): 17-25 eV, delay independent (triple ionisation by one pulse); 1.5-7 eV (the low band, assigned to N2O+ ionised further) and 7-16 eV (the high band, N2O2+ ionised further); the low band falls fast in the first 500 fs and slowly over the next few ps, the high band falls to ‘around 8 eV in the first 200 fs’ and stays constant (p. 2). No time constant is fitted. - fragment energies in the probe’s explosion (pp. 4-6): O+ around 4 eV from the first step N2O2+ -> N2+ + O+, constant with delay; N+ around 5 eV from N2O2+ -> N+ + NO+; the explosion of NO^2+ (NO+ ionised by the probe) about 9.5 eV in total (N+ around 5, O+ around 4.5 eV); the O+ of the three-body N+ + N+ + O channel falls from 1.5 eV at 400 fs to 0.5 eV at 1500 fs; in the N + N+ + O+ channel the ion from the neutral atom has about 1.5 eV and the other two share about 7.5 eV at 400 fs.

STATES AND CHANNELS (assignments, pp. 1-3, 5-6): the low KER band’s fast fall is assigned to dissociation on N2O+ B 2Pi, with significant bending before it dissociates (Dalitz plots, Fig. 3), and with the concerted breakup dominant and the sequential breakup growing with delay. N2O2+: X 3Sigma-, 1 1Delta and 1 1Sigma+ dissociate to N+ + NO+, the higher 1 3Pi and 1 1Pi to N2+ + O+ by coupling to other states (quoted from their Refs. 21, 31, 39); two two-body (N+ + NO+, N2+ + O+) and two three-body (N+ + N + O+, N+ + N+ + O) channels of the dication are identified.

QUOTED LIFETIMES (p. 1, not taken; the originals are not in the library): N2O+ A 2Sigma+ vibrational levels ‘tens to hundreds of nanoseconds’ (their Refs. 20-22); B 2Pi 30 fs from two-photon absorption spectroscopy (Ref. 23); C 2Sigma+ ~2 ps from ion-electron coincidence (Ref. 24). The fast decay of the low band is ‘a little longer than the estimated lifetime of B 2Pi (~30 fs)’ (p. 2; no number).

FIGURES FOR LATER (TC-970): Fig. 2(a), the KER against delay (a raster map with vector axes), if a time constant of the B 2Pi dissociation is wanted; the delay-resolved correlations (Figs. 4-6, vector) are not relevant to the products.

Recorded bibliographic identity status: VALIDATED. This concerns identification of the source; it does not establish the scientific correctness of its contents.

Datasets

No datasets are recorded.

Formulas

No formulas are recorded.

Corrections

No dataset errata are recorded in this source record.

Formula corrections, where recorded, appear with their formulas above. Curation notes may also discuss corrections or unresolved interpretation. Consult the review register for the checks and decisions.