Signatures of photon effect in the tunnel regime

Faisal F, Schlegel G (2005)
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 38(13): L223-L231.

Journal Article | Published | English

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It is widely believed that intense-field ionization occurs either though a 'multiphoton' mechanism (for Keldysh parameter gamma > 1) or through a tunnelling mechanism (or 'field ionization'), for gamma < 1. Recently, high-resolution measurements of the parallel-momentum distributions of electrons emitted from He and other atoms in intense laser fields have been reported in this journal and elsewhere. They revealed a remarkable central minimum with two 'horn-like' ends and a double sequence of sharp peaks in the tunnel regime (gamma < 0.5). They are thus found to contradict the smooth distributions observed under lower resolution in the past, which had been widely interpreted to arise from the field-ionization (or tunnelling) mechanism. In this letter, we present a discrete photon analysis of the parallel-momentum distributions for the case of He atom. Our analysis is based on the well-known KFR (Keldysh-Faisal-Reiss) theory of intense-field processes that explicitly take account of discrete absorptions of photons; it is also modified to take account of the asymptotic Coulomb potential. Results are obtained for both constant-amplitude fields and short Gaussian pulses. Comparison of the results shows that the prominent features in the calculated parallel-momentum distributions arise from a discrete photon absorption mechanism in the 'tunnel regime' and agree qualitatively well with observed distributions.
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Faisal F, Schlegel G. Signatures of photon effect in the tunnel regime. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS. 2005;38(13):L223-L231.
Faisal, F., & Schlegel, G. (2005). Signatures of photon effect in the tunnel regime. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 38(13), L223-L231.
Faisal, F., and Schlegel, G. (2005). Signatures of photon effect in the tunnel regime. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 38, L223-L231.
Faisal, F., & Schlegel, G., 2005. Signatures of photon effect in the tunnel regime. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 38(13), p L223-L231.
F. Faisal and G. Schlegel, “Signatures of photon effect in the tunnel regime”, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, vol. 38, 2005, pp. L223-L231.
Faisal, F., Schlegel, G.: Signatures of photon effect in the tunnel regime. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS. 38, L223-L231 (2005).
Faisal, Farhard, and Schlegel, G. “Signatures of photon effect in the tunnel regime”. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 38.13 (2005): L223-L231.
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