His publications for this period were mainly concerned with the theory of effects found in experiments on optical pumping, e.g. double refraction in a gas due to spin alignment. Professor Series has written an introduction to the life and work of Pancharatnam.
Professor Series's publications for this time frame primarily explored the theoretical implications of optical pumping experiments, including double refraction in gases caused by spin realignment. He has composed a detailed account of Pancharatnam's life and professional achievements.