Impulsive technique has been used for Mechanoluminescence (ML) measurements in γ -irradiated Er doped CaF₂ crystals. The crystals of CaF₂ : Er were grown by Bridgman technique at BARC Mumbai. The cleaved crystals were annealed at 450 ⁰C for about two hours and cooled very slowly and then irradiated for different time from ⁶⁰Co source having an exposure rate of 2.8x10³ Gy/hr. ML is excited impulsively by the impact of moving piston onto γ - irradiated CaF₂: Er crystals. Two peaks are observed in ML intensity V_S time curve and it is seen that the peak intensity of first and second peak ( I_m1 and I_m2) increases with increasing impact velocity. However the time corresponding to first and second peak (t_m1and t_m2) shift towards shorter time values with increasing impact velocity. It is also seen that the total ML intensity I_T initially increases with the impact velocity and then it attains a saturation value for higher values of the impact velocity. Theoritical model is proposed which explains the experimental results satisfactorily .

• Legal notice:
  

  Copyright (c) Pielaszek Research, all rights reserved.
  The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
  In every case, proper references including Author(s) name(s) and URL of this webpage: https://science24.com/paper/9737 must be provided.