I wonder whether this would be appropriate for your research needs:
Birmes P, Brunet A, Benoit M, Defer S, Hatton L, Sztulman H, Schmitt L: Validation of the Peritraumatic Dissociative Experiences Questionnaire self-report version in two samples of French-speaking individuals exposed to trauma. Eur Psychiatry 2005, 20(2):145-151.
See http://www.johnbriere.com/multiscale.htm for more details. If you want a scale that measures a day-to-day consequence of dissociation is Broadbent et al.'s cognitive failure questionnaire. It is compared with the DES in the linked paper.
Article Dissociation, cognitive failures, and working memory
The most robust objective diagnostic measure of dissociative disorders is the multidimensional inventory of dissociation (MID).
Dell, P. F. (2006). The multidimensional inventory of dissociation (MID): A comprehensive measure of pathological dissociation. Journal of Trauma & Dissociation, 7(2), 77-106.
Members of the International Society for the Study of Trauma and Dissociation can download it directly from the members’ area at: http://www.isst-d.org/
It is freely available upon request—without charge—to all mental health professionals from Dr. Paul F. Dell. [email protected].