TEMPO (Trigger-Event Modulated Probability Observation) improves the amount of information obtained for a given electron dose, the information efficiency, of STEM experiments. The concept is simple: there is a large diminishing return on information as more electrons are detected from each point in a STEM scan, so for each dwell period, quickly turn off the electron beam after a given number of electrons are counted (typically 1 ‒ 25) and turn it back on at the start of the next dwell period. In this new imaging paradigm, TEMPO, pixel intensity is defined by the time taken to detect a fixed number of electrons, as opposed to the number of electrons detected in a fixed time. While this distinction may seem small the implications for minimizing specimen damage are substantial. TEMPO is an optional item for either EDM Basic or EDM Synchrony. Please make sure to include either EDM Basic or EDM Synchrony in the configuration. If EDM Basic or EDM Synchrony is already configured in the delivered TEM, only TEMPO can be retrofitted.
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