Use of amount-of-substance terminology and equations in field desorption theory

Forbes, Richard G. (2020) Use of amount-of-substance terminology and equations in field desorption theory Topics in Catalysis.

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Abstract

This note proposes that the theories of field evaporation and field desorption, as used in atom-probe microscopy and related atomic-level contexts, should be consistently formulated in terms of a set of "seven-dimensional (7-D)" formulae and equations that involve the physical quantity "amount of substance", but make use of an atomiclevel constant effectively equal to "one atom" (or, more generally, "one entity"). It is argued that the term "count" should be introduced as an alternative name (more suited to atomic-level contexts) for the quantity "amount of substance". For field evaporation/desorption theories, relevant definitions and formulae are proposed, and compared with the "six-dimensional" system (based on the dimensionless quantity "number of atoms/entities") sometimes used in the literature. Advantages of using a 7-D system are noted. It is argued that there is also an increasing need for a comprehensive system of official nomenclature for atomic-level constants and units, for all three of the extensive quantities "mass", "electric charge" and "amount of substance". It is also argued that, in the longer term, considerations of the kind being proposed here for field evaporation/desorption theories might usefully be applied more generally in atomic-level rate theory.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :	Name Email ORCID Forbes, Richard G. R.Forbes@surrey.ac.uk
Date :	2020
Copyright Disclaimer :	© The Author(s) 2020
Uncontrolled Keywords :	Field evaporation theory; Amount of substance; Counting units; Atomic-level constants
Related URLs :	Publisher
Depositing User :	Clive Harris
Date Deposited :	31 Jul 2020 15:17
Last Modified :	31 Jul 2020 15:17
URI:	http://epubs.surrey.ac.uk/id/eprint/858335

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