absorption cross section


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absorption cross section

[əb′sȯrp·shən ¦krȯs ′sek·shən]
(electromagnetism)
In radar, the ratio of the amount of power removed from a beam by absorption of radio energy by a target to the power in the beam incident upon the target.
References in periodicals archive ?
The largest absorption cross section at 767 nm of 3 at.% Tm, 3 at.% Y:Ca[F.sub.2] improves to 0.45 x [10.sup.-20] [cm.sup.-2], much larger than that reported in [14].
[[sigma].sub.ij] and [[[tau]].sub.ij] are the absorption cross section and lifetime between the two adjacent energy levels, respectively.
Although the absorption cross section luminescence efficiency of lanthanides can be improved using organic ligands and energy transfer (antenna effect), the chelate molecules luminescence is quenched by PMMA nonradiative transitions and efficient luminescence can be observed only for triplet state europium ([Eu.sup.3+]) and terbium ([Tb.sup.3+]) complexes [19-26].
Cao et al., "Light scattering and extinction measurements combined with laser-induced incandescence for the real-time determination of soot mass absorption cross section," Analytical Chemistry, vol.
Zirconium alloys are used for fuel rod cladding in fission reactors owing to their small absorption cross section for neutrons.
In this case, the absorption cross section per unit length of a cylinder is obtained
The ground-state absorption cross section, [[sigma].sub.g], is calculated from [alpha]= [[sigma].sub.g]NC, where N is Avogadro's number and C is the concentration in mol [cm.sup.-3].
The cladding material should have good oxidation resistance, proper delay of the ballooning and burst [2], stress resistance, and small thermal neutron absorption cross section.
For nanoparticles in the Rayleigh regime with appreciable absorption cross section, damping of resonant absorption yields a strong photothermal response influenced by incident intensity, NP morphology [39, 40], and host media [41-43].
This behavior of [m with photon energy may be attributed to the photoelectric absorption cross section which is relative to [E.sup.3.5].
Much effort has been made to improve the detection sensitivity, such as changing the scattering and absorption cross section via chemical approach [5] or a local electromagnetic field enhancement mechanism [6,7].