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The Compton Effect Research Presentation. PHYS-3313, Fall 2013 Nov. 27, 2013 Brian Ferguson, Garrett Brown, Greg Collier, and Ravi Subramaniam Presented by Greg Collier. Hamlet’s Particle One Boson’s answer to the question ‘To be (A particle) or not to be (A particle)?’.

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the compton effect research presentation

The Compton EffectResearch Presentation

PHYS-3313, Fall 2013

Nov. 27, 2013

Brian Ferguson, Garrett Brown, Greg Collier, and Ravi Subramaniam

Presented by Greg Collier

hamlet s particle one boson s answer to the question to be a particle or not to be a particle
Hamlet’s ParticleOne Boson’s answer to the question‘To be (A particle) or not to be (A particle)?’
a brief history of light
A Brief History of Light
  • In the late 17th and early 18th Century, scientists were divided as to the nature of Light as either corpuscular (particle-like) or wave-like.
  • In the 1700’s Isaac Newton was an avid proponent of the “corpuscular” (particle) theory of Light. He believed Light traveled in straight “rays”.
  • In 1678, Christian Huygens presented his wave theory. He believed that Light propagates as a wave of concentric circles from the point of origin.
  • In 1802, Thomas Young and Augustin Fresnel demonstrated that Light clearly behaves like a wave with their double-slit interference pattern experiments.
  • In 1850, Jean Foucault established that Light travels more slowly in water than in air. This was considered one of the final blows to the corpuscular (particle) theory of Light.
trouble on the horizon
Trouble on the Horizon
  • J. J. Thomson’s classical theory of the scattering of X-rays, though supported by earlier experiments, failed to explain the results of more recent late 19th century and early 20th century experiments.
  • Thomson’s classical theory, based on electrodynamics and Maxwell’s equations, lead to the result that the energy scattered by an electron that is hit by an X-ray was the same regardless of the wavelength of the incident rays.
  • Thomson’s theory of scattering requires that scattering electrons give rise to radiation of the same frequency as that of the radiation falling on them.
  • However, spectroscopic examination of scattered X-rays from graphite and other materials, has yielded wavelengths different from the incident rays!
  • What is going on here? Is classical electrodynamics sufficient to explain X-ray scattering phenomena?
enter quantum mechanics
Enter Quantum Mechanics
  • In 1900, Max Planck presented what is now known as the “Planck Postulate”, the idea that Electromagnetic energy could only be emitted in quantized form with energy being a multiple of E = hc/λ.
  • This postulate replaced classical electromagnetism
  • Knowing that the wavelength and frequency of light are inversely proportional, Compton extended Planck’s conception of the quantized light and predicted that a change in wavelength corresponded to a change in energy.
  • A change in energy after a collision with another particle would imply that light carried momentum as well as energy.
  • Could Photons have mass?
enter the compton effect
Enter the Compton Effect
  • X-rays scattered from a target are expected to have an increase in wavelength and a deviation in angle of their flight path with respect to the equation shown.
  • Electrons are predicted to recoil with relativistic velocities depending on photon energy and scattering angle.
animation of the process
Animation of the Process

PennState Animations for Physics and Astronomy

experimental setup
Experimental Setup
  • In order to test this theory, a Molybdenum X-ray tube emits high energy photons towards carbon target placed at different angles.
  • The scattered X-rays are diffracted through a slowly rotating calcite crystal so that the intensities of specific X-ray wavelengths can be measured.
  • An ionization chamber measures the intensity of X-rays at specific wavelengths.
plot of scattered photon behavior
Plot of Scattered Photon Behavior

More energy transferred to election at steeper angles

Intensity vs. Scattering Angle of Photons. Classical Theory vs. Compton’s Theory

implications
Implications
  • This shows that the photon behaves like a particle, showing that Einstein was correct on the Photon Particle Concept.
  • Light does have momentum.
  • Light is quantized.
  • Thus, photons exhibit a particle wave duality.
applications of the compton effect
Applications of the Compton Effect
  • As it is the case for many concepts as fundamental as The Compton Effect, it has a wide range of uses in analytical processes…
radiobiology
Radiobiology

The Compton Effect is used in Radiation therapy that treats both cancer and thyrotoxicosis

compton scattering imaging
Compton Scattering Imaging

The CE also had revolutionary effects on medical biology. The 3-D Positron Emission Tomography scanner makes a 3-D model of the human brain.

Medicalphysicsweb.org

The Compton Camera utilizes gamma imaging for spectroscopy

bhcancercenter.com

nuclear compton scattering
Nuclear Compton Scattering
  • In Nuclear physics, many researchers take advantage of The Compton Effect by bombarding their substrate with Gamma rays and detecting them as they scatter.

Compton Scattering and 3He Three-body Photodisintegration

"A High-pressure Polarized 3He Gas Target for the High Intensity Gamma Source (HIγS) Facility at Duke Free Electron Laser Laboratory", K. Kramer, X. Zong, R. Lu, D. Dutta, H. Gao, X. Qian, Q. Ye, X. Zhu, T. Averett, S. Fuchs, Nuclear Inst. and Methods in Physics Research, A, 582, 318-325, 2007

inverse compton scattering
Inverse Compton Scattering
  • Inverse Compton Scattering is widely used in astrophysics.
  • X-Ray telescopes are fundamentally based on the Compton Effect.

http://venables.asu.edu/quant/proj/compton.html

slide18
CGRO

Compton Gamma Ray Observatory

The Compton Gamma Ray Observatory uses the principles of the Compton Effect as analytical equipment onboard the space shuttle Atlantis.

I could cover the Electromagnetic spectrum from 30 keV to 30 GeV.

It utilizes:

Burst And Transient Source Experiment

Oriented Scintillation Spectrometer Experiment

Imaging Compton Telescope

Energetic Gamma Ray Experiment Telescope

attack of the acronyms
Attack of the Acronyms

COM

GMA

LCS

GLECS

Comtal

UVvis

FTIR

NMR

NDT

LXeGRIT

LXeTPC

SPECT (is)

Micro-TPC

slide20

Compton Scattering can even explain why the sky is blue.

The Oxygen molecules as dioxide and trioxide scatter the UV rays causing them to lose momentum and shift to the visible spectrum and appear blue.