blazewicz_1988
==============

P\. R\. Blazewicz and J\. C\. Miller, "Nonlinear optical processes in xenon and krypton studied by two\-color multiphoton ionization", Phys\. Rev\. A 38, 2863 \(1988\)

`Source record <https://github.com/LupoLab/optmat/blob/main/src/optmat/data/sources/blazewicz_1988.toml>`__ · :doc:`Catalogue </the-data/sources>` · :doc:`Review register </register>`

DOI: `10\.1103/PhysRevA\.38\.2863 <https://doi.org/10.1103/PhysRevA.38.2863>`__

**Source kind:** measurement

**Recorded technique:** Two XeCl\-pumped dye lasers \(10 ns\) focused from opposite sides into a stainless\-steel ionisation cell\: laser one \(about 1 mJ uv, about 5 x 10^8 W/cm2\) three\-photon resonant with Kr 5s\[3/2\]1 \(370\.6 nm\) or Xe 6s'\[1/2\]1 \(388\.6 nm\) and generating its third harmonic; laser two \(about 10^9 W/cm2\) tuned to the one\-photon transitions to higher even\-parity levels \(Kr 6p, Xe 5f\)\. Electrons collected on a biased wire \(gated integrator\); the vuv third harmonic detected by photoionising NO in a second cell behind a MgF2 window\. Xe 5\-25 Torr \(25 Torr with 150 Torr of Ar\), Kr 4 Torr \(pp\. 2864\-2867\)\.

**Materials in structured entries:** None recorded.

**Dataset quantities:** None recorded.

**Contents:** 0 datasets; 0 formulas.

Curation notes
--------------

No datasets\. Identity checked on the first page\: Blazewicz and Miller, Phys\. Rev\. A 38 \(No\. 6, 15 September 1988\), 2863\-2870; PDF pages 1\-8 = journal pp\. 2863\-2870\.

WHAT IT SHOWS \(qualitative\)\. At the three\-photon J = 1 resonances \(Kr 5s\[3/2\]1, Xe 6s'\[1/2\]1\) the third harmonic generated to the blue of the resonance \(Delta k \< 0\) cancels the three\-photon excitation \(one\- and three\-photon paths interfere\); the upper levels are then reached mainly by one third\-harmonic photon plus one laser\-two photon, which favours the J = 2 levels two\-photon\-allowed from the ground state \(Xe 5f\[5/2\]2 and 5f\[3/2\]2, Figs\. 6\-11\), and by dissociation of collision complexes \('At 1 Torr, approximately 10 % of the molecules are best represented as such collision complexes' within the 10 ns pulse, p\. 2864\)\. Coupling to the four\-photon level by laser two changes the third\-harmonic phase matching, Delta k = Delta k0\(delta1\) / \[1 \- \|Omega12\|^2 / delta1 \(delta2 \+ i Gamma2\)\] \(p\. 2870, after Payne and Garrett, unpublished\)\: ionisation peaks turn into dips near optimum phase matching, and third\-harmonic generation is enabled on the red side\.

WAVELENGTHS\. The printed 370\.6 nm \(Kr 5s\[3/2\]1; Fig\. 4 caption 370\.7 nm\) and 388\.6 nm \(Xe 6s'\[1/2\]1\) are air wavelengths\: NIST \(TC\-983 levels\) gives 3/80916\.768 cm^\-1 = 370\.75 nm and 3/77185\.041 cm^\-1 = 388\.68 nm in vacuum, 370\.65 and 388\.57 nm in air\. Fig\. 10's caption puts laser one '0\.5 A' to the red of 6s', the text '0\.05 nm' \(the same\)\.

NOT TAKEN \(no quantity\)\: everything\. The ion and third\-harmonic yields are spectra in arbitrary units, in scanned \(raster\) figures; the paper prints no cross section, transition strength, Rabi frequency, n2 or chi\(3\) value\. For OEP 6, Q2\: the paper has no krypton two\-photon ionisation data at all \(no table, no vector or raster figure of a cross section\)\. For OEP 8\: nothing bears on the 6p\[1/2\]0 strength; the cancellation it shows needs a one\-photon path to the resonant level, which the even\-parity two\-photon levels lack\.

Register\: TC\-1000\.

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

Datasets
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No datasets are recorded.

Formulas
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No formulas are recorded.

Corrections
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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 :doc:`review register </register>` for the checks and decisions.