J.O. Akinlami  , A.M. Awobode  , 
    Photoemission Properties of Cesiated Copper: Theory,
    Journal of Engineering and Applied Sciences,
    Volume 2,Issue 8,
    2007,
    Pages 1279-1282,
    ISSN 1816-949x,
    jeasci.2007.1279.1282,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2007.1279.1282)
    Abstract: Here we report the photoemission properties of cesiated copper. The theoretical Photoemission (PES) spectrum at  w = 6.5eV shows 4 distinct structures but we have 2 peaks in the energy range-4.0 to-2.6eV. On increasing the photon energy, the left-hand peak fades away, then makes a comeback. At  w = 7.1eV, there is a single broad pieces of structure which splits into a doublet on going to  w = 8.2eV. The behaviour of the structure obtained on varying the photon energy is characteristics of direct transitions.
    Keywords: Photoemission;band structure;Energy Distribution Curve (EDC);photon energy;symmetry points and valence bands