augst_1989

S. Augst, D. Strickland, D. D. Meyerhofer, S. L. Chin and J. H. Eberly, “Tunneling ionization of noble gases in a high-intensity laser field”, Phys. Rev. Lett. 63, 2212 (1989)

Source record · Catalogue · Review register

DOI: 10.1103/physrevlett.63.2212

Source kind: measurement

Recorded technique: Ion yields of He, Ne, Ar, Kr and Xe (charge states up to Xe12+) against peak intensity, mid-1e13 to mid-1e16 W/cm^2: chirped-pulse-amplified Nd:glass laser, 1.053 um, ~1 ps (bandwidth 30 A as printed here), f/6 focusing (20 cm lens); intensity from energy, pulse width (second- and third-order correlation, shot-to-shot relative width from frequency doubling) and focal spot (equivalent target plane); gas backfilled to ~5e-6 Torr; time-of-flight spectrometer (800 V/cm, 30 cm drift), microchannel plate (pp. 1-2).

Materials in structured entries: None recorded.

Dataset quantities: None recorded.

Contents: 0 datasets; 0 formulas.

Curation notes

Identity checked against pdf p. 1. Pages are pdf pages (1-4 = pp. 2212-2215).

WHY NOTHING IS TAKEN. The data are figures only: Fig. 1 (p. 2), the approximate number of argon ions detected against peak intensity (‘Similar graphs have been constructed for He, Ne, Kr, and Xe’, not shown); Fig. 2 (p. 2), the appearance intensity of every observed charge state of the five gases against the sequential ionisation potential; Fig. 3 (p. 3), calculated (barrier-suppression) against experimental appearance intensities. No appearance intensity is printed as a number. The full data are in the companion paper augst_1991 (also figures only).

NUMBERS IN THE TEXT. Appearance intensity: ‘the intensity at which ten ions of that species are detected’ (p. 2); ‘the ten-ion level corresponds to an ionization probability of ~5 x 10^-3 for the lowest charge states’ (p. 2). Uncertainty: ‘The uncertainty in the absolute value of the intensity is approximately a factor of 2’ (p. 1); relative intensities among runs and gases (mixed-gas targets) ‘less than 25%’ (p. 2). The appearance intensities are ‘as much as a factor of 10’ higher than those with 50 ps pulses at the same wavelength (L’Huillier et al., J. Phys. B 16, 1363 (1983), ref. 2; p. 2). ADK (Ammosov et al. 1986): ‘all of the appearance intensities are matched within the factor of 2 absolute uncertainty in the experimental intensity’, but ‘the deviation between experimental and predicted intensities systematically increases with decreasing atomic weight’ (p. 3); augst_1991 Table 1 quantifies this as intensity shift factors. Discrepancies with augst_1991 (the same laser): bandwidth 30 A here against ~20 A there, f/6 here against f/5 there.

FORMULAS (not recorded separately; the same model is augst_1991’s bsi_threshold, in SI there). Eqs. (4)-(6), p. 3, Gaussian units: V(x) = -Z e^2/x - e epsilon x; critical field epsilon^2 = E_ion^4/(16 e^6 Z^2); appearance intensity I_app = c E_ion^4/(128 pi e^6 Z^2), ‘Using no free parameters, excellent agreement is obtained over almost three decades of intensity for all charge states’ (p. 3). Eq. (2): Phi_pond (eV) = e^2 epsilon^2/(4 m omega^2) = 9.33 x 10^-14 I lambda^2 (I in W/cm^2, lambda in um).

Recorded bibliographic identity status: VALIDATED_WITH_WARNINGS. 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.