Constructing Quantum Mechanics Volume Two

This second volume explores the development of quantum mechanics from 1923 to 1927, detailing the transition from old theories to matrix and wave mechanics, culminating in their unification.

Constructing Quantum Mechanics Volume Two delves into the evolution of quantum mechanics during the transformative years of 1923 to 1927. This second volume continues the exploration of the early 20th century's scientific advancements, detailing the shift from classical to modern quantum theory. It begins by addressing the challenges faced by the old quantum theory in the early 1920s, including the introduction of key concepts such as the exclusion principle and electron spin.

The narrative then follows the development of two pivotal forms of new quantum mechanics: matrix mechanics and wave mechanics. The text meticulously outlines how these new theories emerged to resolve the limitations of their predecessor while enhancing its foundational successes. The author illustrates the significant progress made within this period, culminating in the unification of these two approaches in 1927 through statistical transformation theory and the Hilbert space formalism.

Throughout the volume, readers are presented with a thorough analysis of seminal papers authored by influential physicists such as Heisenberg, Born, and Schrödinger. By incorporating correspondence and reminiscences from these scientists, alongside extensive secondary literature, the book contextualizes the groundbreaking discussions that shaped modern quantum mechanics. Ultimately, it posits that the development of this field can be likened to building an arch supported by the old quantum theory, which was eventually set aside once the new framework proved self-sustaining.