Meaning: The quote by John Pople, a renowned scientist and Nobel laureate in Chemistry, provides insight into his return to Pittsburgh and his decision to revisit the fundamental problems of electronic structure. This quote reflects Pople's commitment to exploring and understanding the intricacies of electronic structure, a subject that had intrigued him for many years.

John Pople was a pioneering figure in the field of computational chemistry and made significant contributions to our understanding of the electronic structure of molecules. His work laid the groundwork for the development of computational methods that are widely used in the study of molecular systems today.

Pople's decision to return to Pittsburgh signifies a pivotal moment in his career, where he sought to delve deeper into the fundamental principles of electronic structure. This return may have been motivated by a desire to reconnect with the intellectual environment and resources available in Pittsburgh, which could potentially aid in his pursuit of addressing these fundamental problems.

The phrase "fundamental problems of electronic structure" refers to the core questions and challenges related to the arrangement and behavior of electrons within atoms and molecules. Understanding electronic structure is crucial for comprehending the chemical and physical properties of matter. It encompasses the distribution of electrons in energy levels, bonding patterns, and the overall stability and reactivity of chemical species.

Pople's mention of contemplating these problems "abstractly many years earlier" suggests that these concepts had been on his mind for a significant period. It reflects a deep-seated interest and a long-standing intellectual curiosity about electronic structure. His decision to revisit these problems indicates a renewed dedication to tackling these fundamental issues with a fresh perspective and possibly with the benefit of new insights gained over the years.

The resolve expressed in the quote underscores Pople's determination to re-engage with these foundational concepts and potentially make breakthroughs in the understanding of electronic structure. It conveys a sense of purpose and commitment to delving into the complexities of this subject matter, with the aim of unraveling its mysteries and advancing the field of computational chemistry.

Overall, Pople's quote encapsulates his return to Pittsburgh with a clear intention to re-examine the fundamental problems of electronic structure that had captivated his interest for years. It reflects his unwavering dedication to scientific inquiry and his pursuit of deeper insights into the nature of electronic structure. This quote serves as a testament to Pople's enduring intellectual curiosity and his ongoing quest to unravel the mysteries of the molecular world.

In conclusion, John Pople's quote highlights his decision to revisit the fundamental problems of electronic structure upon his return to Pittsburgh. It underscores his commitment to delving into these foundational concepts with renewed vigor and determination, reflecting his enduring intellectual curiosity and dedication to advancing our understanding of the electronic structure of molecules.