Two-photon photoelectron spectroscopy

Time-resolved Two-Photon Photoelectron (2PPE) spectroscopy is a time-resolved spectroscopy technique which is used to study electronic structure and electronic excitations at surfaces. The technique utilizes femtosecond to picosecond laser pulses in order to first photoexcite an electron. After a time delay, the excited electron is photoemitted into a free electron state by a second pulse, as shown in Figure 1. The kinetic energy and the emission angle of the photoelectron are measured in an electron analyzer. To facilitate investigations on the population and relaxation pathways of the excitation, this measurement is performed at different time delays.

This technique has been used for many different types of materials to study a variety of exotic electron behaviors, including image potential states at metal surfaces, and even electron dynamics at molecular interfaces.

Basic physics

The final kinetic energy of the electron can be modeled by the following equation:

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PPE

PPE may refer to:

Science and medicine

  • Palmoplantar erythrodysesthesia syndrome
  • Porcine proliferative enteropathy, a type of enteropathy in pigs
  • Proximal promoter element, a component of a promoter region in genetics
  • Pruritic papular eruption of HIV disease
  • Polyphenyl ether, a class of polymers

    • Computing

  • Power Processing Element, in microprocessor architecture
  • PCBoard Program Executable, for the PCBoard bulletin board system

    • Organisations

  • Park Place Entertainment, now part of Caesar's Entertainment
  • European People's Party
  • European People's Party Group (EPP Group)

    • Other uses

  • Personal protective equipment
  • Philosophy, Politics and Economics, an academic degree
  • ProgPower Europe, a progressive metal festival held in the Netherlands
  • Property, plant and equipment, or fixed assets, in accounting
  • Puerto Peñasco International Airport (IATA code), Mexico
  • Mar de Cortés International Airport (IATA code), Mexico
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    That Day

    by: Poe

    Tomorrow's coming 'round
    A hair-pin curve in the road
    She's got a run in her stocking
    And she's missing the heel of her shoe
    Got up this morning rolled out of bed
    I spilled a diet coke
    Called my mother said, "Hi"
    What I meant to say was, "Why is your life a joke?"
    Then, I went down to that ugly bar and
    I clicked my heels three times just like you said
    And I climbed that road to your empty house
    The anticipation was a turn on
    But you let me down
    'Coz, I stood on that empty street alone
    I said, "I'm ready for my close up now, Mr. Demille"
    I waited for the light, but it never shone
    Well I wonder what you do with that expensive piece of land
    That overlooks a billion years of history
    I have a sneaking suspicion, you will never understand
    Hey maybe I'll see you down by the Rocky and Bullwinkle
    And we can talk to that charlatan psychic
    And she can paint a prettier picture of your future
    'Coz that day in my life, that day in my life
    I dreamt tomorrow, had a prettier face
    I dreamt tomorrow, would have better things to say
    Than, "You look like shit, what's your problem, bitch?
    You're legs feel like sandpaper, you can't do anything right"
    'Coz that day, never should have taken place
    'Coz this day, in my life still cannot explain
    Why I listened in the first place to you?
    Oh yeah, something else
    I hope one day you call up your father
    And you have the guts to tell him, how he hurt you
    And he made you hurt another




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