Photon emission Definition and 70 Threads

Time-resolved photon emission (TRPE) is used to measure timing waveforms on semiconductor devices. TRPE measurements are performed on the back side of the semiconductor device. The substrate of the device-under-test (DUT) must first be thinned mechanically. The device is mounted on a movable X-Y stage in an enclosure which shields it from all sources of light. The DUT is connected to an active electrical stimulus. The stimulus pattern is continuously looped and a trigger signal is sent to the TRPE instrument in order to tell it when the pattern repeats. A TRPE prober operates in a manner similar to a sampling oscilloscope, and is used to perform semiconductor failure analysis.

View More On Wikipedia.org
Recent contents Top users
  1. V

    Photon Emission: Atom Collapse & Radial Forces Explained

    I'm sure I've heard the explanation for this before in class but I can't quite remember it: If electrons of an atom emit photons (ie lose energy), the orbits of the electrons will become smaller, right? If so, wouldn't the atom eventually collapse? What radially outward force keeps the...
  2. H

    How Many Photons Hit Your Retina from a Distant Light Source?

    Homework Statement A light bulb 10km away from you emits visible photons at a rate of 3x1018 photons/s. Assuming this is the only source of light (the whole place is dark), and your dark-adjusted retina has a diameter of 7mm, then how many photons/s hits your retina? Homework Equations...
  3. N

    Single Photon Emission: Examining the Evidence

    On the web are some informed-sounding discussions saying that the various videos showing the appearance of the dots on the photo-sensitive surfaces can by no means guarantee that only one photon got through. A lot hinges on that, thanks for referring me to other posts which show certainty of a...
  4. snoopies622

    Photon emission from simple harmonic oscillator

    I've looked at a few introductory treatments of the quantum harmonic oscillator and they all show how one arrives at the discrete energy values E_n = ( \frac {1}{2} + n ) hf \hspace {10 mm} n=0,1,2... usually by setting up and then solving the Schrodinger equation for the system...
  5. D

    Calculating Width of One-Dimensional Box for Photon Emission

    Homework Statement When a hydrogen atom undergoes a transition from the n=2 state to the n=1 level, a photon with \lambda=122nm is emitted. a)If the atom is modeled as an electron in a one-dimensional box, what is the width of the box in order for the n=2 to n=1 transition to correspond...
  6. T

    How Does Recoil Affect Photon Emission and Absorption Frequencies?

    Homework Statement Show that the fractional change in frequency of a photon absorbed or emitted by an atom initially at rest is \frac{\nu - \nu_o}{\nu} = \pm \frac{h\nu}{2Mc^{2}} where M is the mass of the atom, \nu_o is the frequency of the transition uncorrected for the recoil of the atom. In...
  7. T

    Negative energy photon emission

    Let's say we just had a normal atom in energy state E, and one of the electrons jumps down to a lower orbital E'. Of course, E - E' is positive because E' is a lower orbital than E, so the energy of the photon emitted must be positive. But what if E' were a higher orbital than E? Could the...
  8. N

    How Do Gravitons and Photons Compare in Quantum Theory?

    Based on the following excerpt, I'd appreciate any general comments/observations and then follow with a specific question. Leonard Susskind says in THE BLACK HOLE WAR, 2008, PG 347 : #: my parenthetical comment I knew physics was crazy, but that just seems "over the horizon" crazy...
  9. C

    What is the process of photon emission in atoms?

    k my physics background is limited , I know that photon emission is when the electron moves down in energy level thus releasing a photon but how does the photon get inside the electron , the energy that moves the electron into a higher level when this energy moves the electron out their...
  10. G

    Accelerated electron photon emission

    Classically, I think it is correct to say that Maxwell implies an accelerated electron will "radiate" What is the quantum take on this please? In particular, what determines the wavelength of the emitted photon? PS I may ahve asked something like this before, but I never found an answer...
  11. J

    Photon Emission: Direction & Probability

    Can someone tell me about photon emission? If an electron bound to a nucleus emits a photon and drops to a lower energy level, in what direction does the photon go? - Does it leave the electron perpendicular to the tangent line of the electon's 'orbit' at the instant of emission - that is...
  12. T

    Derivation photon emission angle/frequency

    I've been obsessed with the derivation in the attachment for hours now, all rights & credits to the one who came up with it, but I completely can't follow it. How does one get rid of the e's and epsilons?! How to combine the momentum and energy equations? Squaring gives for me just onworkable...
  13. J

    Is photon emission spherical or linear?

    What happens when a single atom emits a single photon? Does the photon itself exist as a spherical wavefront that propagates in all directions? Or is it ejected as a tiny, "vibrating ball"? In other words, is the spherical wavefront of a light source (like a star) just the result of the...
  14. H

    Special Relativity: Photon emission by a moving atom

    Homework Statement The problem involves an atom (Said to be in an excited state of energy Q_0) traveling towards a scintillation counter with speed v. The atom then emits a photon of energy Q and stops completely. The rest mass of the atom is m. I'm supposed to show that Q =...
  15. D

    Understanding Photon Emission from Atoms

    Hi. This isn't so much a homework question, but more of a conceptual understanding question. Lets say an atom has a ground energy level defined at 0J. The energy levels are: E1 = 0 J E2 = 7.77*10^-19 J E3 = 10.66*10^-19 J E4 = 14.1*10^-19 J E5 = 16.6*10^-19 J Now, if an electron...
  16. Q

    How Does Recoil Affect Photon Emission Frequency in Special Relativity?

    I’m having some trouble with a question from my special relativity assignment. It relates to the frequency of a photon emitted from an atom which then subsequently recoils. The atom has initial rest mass m0, and loses rest energy ‘e’ in the emission (“e is the difference between the rest...
  17. H

    Exploring the Physics of Photon Emission

    When a photon is emitted, where did it come from? Did something cause it to be created and then emitted, or was it inside something and then released? How's it work?
  18. V

    Photon Emission Rate and Optics Questions

    I'm really lost on these 3 questions. My physics teacher decided she was sick of thermodynamics and gave us this packet over material we haven't covered yet, but she expects us to get it without any problem. I'm really stuck on these: 1. Assume that sodium produces monochromatic light with a...
  19. K

    Is it the Atom or the Electron? Understanding the Photon Emission Process

    when an excited electron emits a photon what happens to the EM field of the electron
  20. S

    Is the direction of a photon's momentum uncertain when emitted from an atom?

    Classically, a pulse of light emitted by an atom would be viewed as an electromagnetic wave radiating spherically symmetrically out from the atom. Quantum mechanically speaking, if say a hydrogen atom emits a single photon, does the photon's wavefunction spread out spherically, us having no idea...
Back
Top