The AIM is a 40-item questionnaire designed to measure the characteristic strength or weakness with which one experiences emotion.The scale is copyrighted but you are free to use it without permission or charge by all professionals (researchers and practitioners) as long as you give credit to the authors of the scale:
Larsen, R. J. (1984). Theory and measurement of affect intensity as an individual difference characteristic. Dissertation Abstracts International, 85, 2297B. (University Microfilms No. 84-22112)
Important Papers on the AIM:
If you would like to know more about AIM and its related research, please read the following papers, whose references are below.These papers can be found on the reprint page (at UIUC).
Larsen, R. J. (2009). Affect Intensity. In M. R. Leary & R. H. Hoyle (Eds.), Handbook of individual differences in social behavior (pp. 241-254). New York: The Guilford Press.
Larsen, R. J., Diener, E., & Emmons, R. A. (1986). Affect intensity and reactions to daily life events. Journal of Personality and Social Psychology, 51, 803-814.
Larsen, R. J., & Diener, E. (1987). Affect intensity as an individual difference characteristic: A review. Journal of Research in Personality, 21, 1-39.