docs: def ev_to_s(offset_us, source_to_detector_m, array):
      # delay values is normal 2.99 us with NONE actual MCP delay settings
      """convert energy (eV) to time (us)
  
      Parameters:
      ===========
      array: array (in eV)
      offset_us: float. Delay of detector in us
      source_to_detector_m: float. Distance source to detector in m
  
      Returns:
      ========
      time: array in s 
      """
      # 1000 is used to convert eV to meV
      time_s = np.sqrt(81.787 / (array * 1000.)) * source_to_detector_m / 3956.
      time_record_s = time_s - offset_us * 1e-6
      return time_record_s