1981 annual report :

Brunt, R J Van; Misakian, M; Leep, D A; Beaty, E C; Gallagher, J W; Cooke, C M; Wyatt, K; Geis, R G

doi:10.6028/nbs.ir.82-2555

Cited by 5 publications

(5 citation statements)

References 66 publications

(209 reference statements)

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“…In principle it should there fore be possible to perform electron scattering at optical resolution. This was indeed the thinking behind the pioneer ing experiments of Gallagher and York [3] and Van Brunt and Gallagher [4] and also our own more recent work [1,2] as well as the very low energy work of Chutjian [5], Gallagher and co-workers opted for a system in which metastable 1D Ba atoms were photoionised at 3250 Å intra-cavity in a He-Cd laser. The resulting photoelectrons had 17 meV energy.…”

Section: Experimental Problemsmentioning

confidence: 85%

Electron Scattering with Photoelectrons

Field¹

1989

Europhys. News

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Section: Experimental Problemsmentioning

confidence: 85%

Electron Scattering with Photoelectrons

Field¹

1989

Europhys. News

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“…The second approach consists in a modification of the maximum likelihood estimation of M 2 which accounts for the significant hop in the order of magnitude of the eigenvalues of RR † when NLJs are present (a point better explained in Subsection III-A2). This discontinuity can be justified by noticing that common JNR values are in the range [30,60] dB [41]. It follows that r can be estimated by detecting this hop in magnitude.…”

Section: A Nlj-only Attackmentioning

confidence: 99%

New ECCM Techniques Against Noiselike and/or Coherent Interferers

Yan

Addabbo

Chen

et al. 2020

IEEE Trans. Aerosp. Electron. Syst.

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Multiple-stage adaptive architectures are conceived to face with the problem of target detection buried in noise, clutter, and intentional interference. First, a scenario where the radar system is under the electronic attack of noise-like interferers is considered. In this context, two sets of training samples are jointly exploited to devise a novel two-step estimation procedure of the interference covariance matrix. Then, this estimate is plugged in the adaptive matched filter to mitigate the deleterious effects of the noise-like jammers on radar sensitivity. Besides, a second scenario, which extends the former by including the presence of coherent jammers, is addressed. Specifically, the sparse nature of data is brought to light and the compressive sensing paradigm is applied to estimate target response and coherent jammers amplitudes. The likelihood ratio test, where the unknown parameters are replaced by previous estimates, is designed and assessed. Remarkably, the sparse approach allows for echo classification and estimation of both angles of arrival and number of the interfering sources. The performance analysis, conducted resorting to simulated data, highlights the effectiveness of the newly proposed architectures also in comparison with suitable competing architectures (when they exist).

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“…Their time of flight between their creation and the collision region is approximately 200 Is. The competition between the cross-section for creation of these atoms in the state of a principal quantum number n (low orbital quantum number/) which varies as n-a, and the radiative lifetimes which vary as n" where 4 < ct < 5 (for large values of after redistribution among by collisions undergone after creation) results in an energy distribution of the electrons between 10 and 40 meV ( Experimental set-up. The SF6 beam with computer controlled temperature (varying between 300K and 1000K), is excited by the CO2 laser beam.…”

Section: Apparatusmentioning

confidence: 99%

Spectral and Temperature Dependence of Laser Induced Dissociative Attachment in SF6

et al. 1982

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We consider the influence of resonant laser excitation upon the dissociative reaction between SF6 molecules and very low energy electrons. Experimentally, the use of valence electrons of atoms in Rydberg states ensures a well-defined energy resolution of the scattering electrons in the crossed beam apparatus. A spectroscopic model of the infrared absorption of CO2 laser radiation by SF6 gives a fair determination of the energy levels and vibrational transitions involved in the dissociative process. This reaction between highly excited atoms and a molecule is interpreted as a three step process: attachment of a quasi-free electron, followed by the interaction between the atomic ionic core and the negative molecular ion leading to a partial stabilization and, finally, the competition between the dissociating and the autodetachment channels.

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1981 annual report :

Cited by 5 publications

References 66 publications

Electron Scattering with Photoelectrons

Electron Scattering with Photoelectrons

New ECCM Techniques Against Noiselike and/or Coherent Interferers

Spectral and Temperature Dependence of Laser Induced Dissociative Attachment in SF6

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