.. _sphx_glr_api_gallery_surface_tpd:

Temperature-programmed desorption
-----------------------------------

Simulated TPD spectra from the Polanyi-Wigner equation, and Redhead's
formula for turning a peak temperature into a desorption energy.


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  <div id='sg-tag-list' class='sphx-glr-tag-list'></div>


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    <div class="sphx-glr-thumbnails">

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    <div class="sphx-glr-thumbcontainer" tooltip="In a TPD experiment a covered surface is heated at a steady rate \beta while the desorbing gas is recorded, and each binding state shows up as a peak. simulate_tpd integrates the Polanyi-Wigner rate equation to produce these spectra. Redhead (1962) turned a first-order peak temperature T_p into a desorption energy: E_d = RT_p[\ln(\nu T_p/\beta) - 3.64] (~chemistrykit.surface.systems.tpd.redhead_desorption_energy). Below, the formula is checked against the exact peak condition (~chemistrykit.surface.systems.tpd.first_order_peak_temperature). First-order peaks shift with heating rate but not with coverage, while second-order peaks move to lower temperature as the coverage rises.">

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  .. image:: /api/gallery/surface/tpd/images/thumb/sphx_glr_plot_01_redhead_tpd_thumb.png
    :alt:

  :doc:`/api/gallery/surface/tpd/plot_01_redhead_tpd`

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      <div class="sphx-glr-thumbnail-title">Redhead's analysis of temperature-programmed desorption</div>
    </div>


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    </div>


.. toctree::
   :hidden:

   /api/gallery/surface/tpd/plot_01_redhead_tpd