peters_2019#

C. J. Peters, M. N. Shneider and R. B. Miles, “Kinetics model of femtosecond laser ionization in nitrogen and comparison to experiment”, J. Appl. Phys. 125, 243301 (2019)

Source record · Catalogue · Review register

DOI: 10.1063/1.5098306

Source kind: theory

Recorded technique: A zero-dimensional kinetics model of the plasma a focused femtosecond pulse leaves in nitrogen (femtosecond laser electronic excitation tagging, FLEET): 54 reactions (Table I) among ten species, electron-impact rates from BOLSIG+ (version 03/2016) with its standard N2 cross sections, fast gas heating, and an electron energy balance; initial N2+ and electron densities from a PPT ionisation rate at a filament-clamped intensity (6.5 x 10^17 W m^-2, n_e = 7.2 x 10^16 cm^-3 at 300 K and 101.3 kPa). Seven uncertain coefficients tuned by a random search (240 000 trials) to the time-resolved first- and second-positive emission measured with a photomultiplier in a nitrogen free jet (800 nm, 70 fs, 0.5 mJ, f = 0.3 m; pp. 243301-2 to -9).

Materials in structured entries: N2+

Dataset quantities: dissociative_recombination_rate_coefficient

Contents: 1 dataset; 0 formulas.

Curation notes#

Identity checked on the article’s first page (PDF page 2 = p. 243301-1; PDF page 1 is a cover sheet): Peters, Shneider and Miles, J. Appl. Phys. 125, 243301 (2019). PDF page n = p. 243301-(n - 1).

Curated: the one dissociative recombination of a registered ion in Table I, R12, e- + N2+ -> 2N, not tuned and taken from refs. 23 (kossyi_1992) and 40 (Popov 2001): the same value and law as kossyi_1992/dr_N2+_N_N.

TUNED, NOT A PROPERTY (notes only; Table I footnote a, Table IV, Sec. III A, p. 243301-8): the cluster-ion recombinations R7-R9, e- + N4+ -> N2(A, B, C) + N2, ‘2.5 %, 87 % and 11 % x 2.4 x 10^-6 sqrt(300/T_e)’ cm^3 s^-1: a base coefficient drawn from 2.6 x 10^-7 to 5.5 x 10^-6 and split at random among the three product states, chosen to fit the emission; also tuned: R5 (energy pooling), R23-R25 (quenching). Table IV lists the literature ranges, e.g. 2.6 x 10^-7 (ref. 34) to 4.6 +- 0.9 x 10^-6 (ref. 37) for N4+. Not registered, notes only: R11, e- + N3+ -> N + N2, 2.0 x 10^-7 sqrt(300/T_e) (refs. 23, 37); R10, 2e- + N4+, 7 x 10^-20 (300/T_e)^4.5 cm^6 s^-1. The model neglects e- + N4+ -> 2N2 in its ground state (p. 243301-2). Other reactions: notes only (plasma kinetics is outside optmat’s scope except as data; TC-954).

The initial conditions are model assumptions: only N2, N2+ and electrons at the end of the pulse (‘photoionization rather than photodissociation dominates’, p. 243301-7), and T_e(t0) = 35 300 K from two photons in excess of the 11-photon threshold, chosen ‘to provide better agreement with experimental results’.

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

Datasets#

peters_2019/dr_N2+#

{
  "id": "dr_N2+",
  "material": "N2+",
  "file": "N2+/peters_2019__dr_N2+.csv",
  "table": "tbl_7c2f4f3bf473",
  "quantity": "dissociative_recombination_rate_coefficient",
  "unit": "cm3/s",
  "scale": 1e-07,
  "abscissa": "none",
  "use": "reproduced",
  "reproduced_from": [
    "kossyi_1992",
    "N. A. Popov, Plasma Phys. Rep. 27, 886 (2001)"
  ],
  "parameters": {
    "products": "N + N (states not given)",
    "law": "power_law",
    "reference_temperature_k": 300.0,
    "exponent": 0.5
  }
}

Table I (p. 243301-3), R12^b: ‘e- + N2+ -> 2N + epsilon_tr’, 2.8 x 10^-7 sqrt(300/T_e) cm^3 s^-1, refs. 23 and 40; footnote b, it contributes to fast gas heating. Not tuned.

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.