Dear Arunan

You have done a great job in pulling all the ideas together.

Whenever I see "D-H" I think the D is deuterium. However I am not sure if there is a better alternative

I agree that Rg is the more usual notation and not Ng.

For my address please use

David C Clary,
Department of Physical and Theoretical Chemistry,
University of Oxford,
South Parks Rd,
Oxford OX1 3QZ,
UK

Thanks and best wishes

David