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For a given particle and its energy, the absorption cross-section of the target material can be calculated from mass absorption coefficient using:
207:) being absorbed by a nucleus. Although the units are given as an area, it does not refer to an actual size area, at least partially because the
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Z smaller than 100 collected for photons with energies from 1 keV to 20 MeV. The discontinuities in the values are due to
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to this area, the unit for the two-photon absorption cross section is named the "GM". One GM is 10 cmâ‹…sâ‹…photon.
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168:.) Typical absorption cross section has units of cmâ‹…molecule. In honor of the fundamental contribution of
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is used in physics to quantify the probability of a certain particle-particle interaction, e.g.,
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521:{\displaystyle \sigma ={\frac {\ln(10)\times 10^{3}}{N_{\text{A}}}}\times \varepsilon }
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is a measure for the probability of an absorption process. More generally, the term
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of absorbing molecules per unit volume times the absorption cross section
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877:"Two-Photon Absorption Measurements: Establishing Reference Standards"
160:, etc. (Note that light in this context is described as consisting of
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Zins, E-L.; Guinet, M.; Rodriguez, D.; Payan, S. (2022-06-01).
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591:{\displaystyle \sigma =(\mu /\rho )m_{\text{a}}/N_{\text{A}}}
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911:"Absolute absorption cross section of 2-EHN in IR region"
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Scattering, absorption and radiative transfer (optics)
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along the path of a beam is the product of the number
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it refers to the probability of a particle (usually a
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16:Mmeasures the probability of an absorption process
211:or state of the target molecule will affect the
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415:{\displaystyle {\frac {dN}{dx}}=-Nn\sigma }
215:of absorption. Quantitatively, the number
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109:Learn how and when to remove this message
238:of photons absorbed, between the points
890:from the original on September 14, 2013
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701:This is also commonly expressed as:
47:adding citations to reliable sources
191:to absorb a photon of a particular
632:is the mass absorption coefficient
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731:{\displaystyle \sigma =\alpha /n}
199:. Analogously, in the context of
307:of photons penetrating to depth
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34:needs additional citations for
884:Australian National University
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806:Photoionisation cross section
128:values for all elements with
789:is the atomic number density
687:{\displaystyle N_{\text{A}}}
654:{\displaystyle m_{\text{a}}}
442:{\displaystyle \varepsilon }
931:10.1016/j.jqsrt.2022.108141
451:mass absorption coefficient
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625:{\displaystyle \mu /\rho }
158:electromagnetic absorption
58:"Absorption cross section"
185:absorption cross section
146:absorption cross section
856:Absorption spectroscopy
851:Attenuation coefficient
801:Cross section (physics)
757:{\displaystyle \alpha }
360:{\displaystyle \sigma }
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766:absorption coefficient
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136:which were also shown.
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811:Nuclear cross section
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43:improve this article
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231:{\displaystyle dN}
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175:In the context of
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340:{\displaystyle n}
327:times the number
320:{\displaystyle x}
300:{\displaystyle N}
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181:ultraviolet light
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960:Electromagnetism
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886:. June 8, 2007.
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126:Cross-sections
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894:September 14,
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831:Transmittance
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60: –
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54:Find sources:
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32:This article
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892:. Retrieved
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197:polarization
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99:October 2018
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41:Please help
36:verification
33:
836:Attenuation
213:probability
954:Categories
924:: 108141.
863:References
663:molar mass
193:wavelength
154:scattering
69:newspapers
940:0022-4073
752:α
718:α
712:σ
620:ρ
612:μ
558:ρ
550:μ
541:σ
516:ε
513:×
487:×
475:
463:σ
437:ε
410:σ
401:−
355:σ
162:particles
888:Archived
794:See also
741:where:
665:in g/mol
601:where:
189:molecule
164:, i.e.,
764:is the
661:is the
209:density
205:neutron
166:photons
142:physics
83:scholar
938:
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914:(PDF)
880:(PDF)
177:ozone
90:JSTOR
76:books
936:ISSN
896:2013
449:and
258:and
195:and
62:news
926:doi
922:283
694:is
140:In
45:by
956::
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920:.
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882:.
491:10
481:10
472:ln
453:.
367::
183:,
156:,
144:,
942:.
928::
898:.
777:n
726:n
722:/
715:=
680:A
676:N
647:a
643:m
616:/
584:A
580:N
575:/
569:a
565:m
561:)
554:/
547:(
544:=
506:A
502:N
495:3
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478:(
466:=
422:.
407:n
404:N
398:=
392:x
389:d
384:N
381:d
335:n
315:x
295:N
275:x
272:d
269:+
266:x
246:x
226:N
223:d
112:)
106:(
101:)
97:(
87:·
80:·
73:·
66:·
39:.
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