Student and Postdoctoral Years, 1920 - 1927
The Sad Story of Heisenberg's Doctorate
In the handling of the present problem, Heisenberg shows
once again his extraordinary abilities: complete command
of the mathematical apparatus and daring physical insight.
In May 1923 Heisenberg returned to Munich from Göttingen, where he had been a visiting student, to finish out his last semester while writing his doctoral dissertation. Knowing Heisenberg's reputation for controversial solutions to problems in quantum theory, Heisenberg's Munich mentor, Arnold Sommerfeld, suggested that he write his dissertation in the more traditional field of hydrodynamics. The title in English is: "On the Stability and Turbulence of Liquid Currents."
Heisenberg also had to take the four-hour
laboratory course in experimental physics offered by Prof. Willy Wien. Wien insisted that any
physicist, including Sommerfeld's brilliant theorists, must be fully prepared in experimental
physics. Wien and Sommerfeld both sat on the candidate's final oral exam and both had to
agree on a single grade in physics.
While Heisenberg struggled through Wien's lab course (much to Wien's displeasure at
the results), Heisenberg prepared his dissertation. He submitted his dissertation, a 59-page calculation titled "On the Stability and Turbulence of Liquid Currents," to the Munich
faculty on July 10, 1923. The topic arose from an earlier research contract Sommerfeld had
received from a company channeling the Isar River through Munich. The problem was to
determine the precise transition of a smoothly flowing liquid (laminar flow) to turbulent flow. It
was an extremely difficult mathematical problem; in fact, it was so difficult that Heisenberg
offered only an approximate solution. "I would not have proposed a topic of this difficulty as a
dissertation to any of my other pupils," wrote Sommerfeld. The faculty accepted the thesis and
Wien accepted it for publication in the physics journal he edited, but when the mathematician Fritz
Noether raised objections in 1926, the results remained in doubt for nearly a quarter century until they
were finally confirmed.
Acceptance of the dissertation brought admission of the candidate to the final orals, where in this case trouble began. The examining committee consisted of Sommerfeld and Wien, along with representatives in Heisenberg's two minor subjects, mathematics and astronomy. Much was at stake, for the only grades a candidate received were those based on the dissertation and final oral: one grade for each subject and one for overall performance. The grades ranged from I (equivalent to an A) to V (an F).
As the 21-year-old Heisenberg appeared before the four professors on July 23, 1923, he easily handled Sommerfeld's questions and those in mathematics, but he began to stumble on astronomy and fell flat on his face on experimental physics. In his laboratory work Heisenberg had to use a Fabry-Perot interferometer, a device for observing the interference of light waves, on which Wien had lectured extensively. But Heisenberg had no idea how to derive the resolving power of the interferometer nor, to Wien's surprise, could he derive the resolving power of such common instruments as the telescope and the microscope. When an angry Wien asked how a storage battery works, the candidate was still lost. Wien saw no reason to pass the young man, no matter how brilliant he was in other fields.
An argument broke out between Sommerfeld and Wien over the relative importance of
theory and experiment. The result was that Heisenberg received the lowest of three passing grades in
physics and the same overall grade (cum laude) for his doctorate, both of which were an average between
Sommerfeld's highest grade and Wien's lowest grade.
Sommerfeld was shocked. Heisenberg was mortified. Accustomed to being always at
the top of his class, Heisenberg found it hard to accept the lowest of three passing grades for his doctorate. Sommerfeld held
a small party at his home later that evening for the new Dr. Heisenberg, but Heisenberg
excused himself early, packed his bag, and took the midnight train to Göttingen, showing up
in Max Born's office the next morning. Born had already hired Heisenberg as his teaching
assistant for the coming school year. After informing Born of the debacle of his orals,
Heisenberg asked sheepishly, "I wonder if you still want to have me."
Born did not answer until he had gone over the questions Heisenberg had missed.
Convincing himself that the questions were "rather tricky," Born let his employment offer stand.
But that fall Heisenberg's worried father wrote to the famed Göttingen experimentalist James
Franck, asking Franck to teach his boy some experimental physics. Franck did his best, but
could not overcome Heisenberg's complete lack of interest and gave up the effort. If
Heisenberg was going to survive at all in physics it would be purely as a theorist.
There is an interesting epilogue to this story. When Heisenberg derived the
uncertainty relations several years later, he used the resolving power of the microscope to
derive the uncertainty relations---and he still has difficulty with it! And again, when Bohr pointed out
the error, it led to emotional difficulties for Heisenberg. Likewise, this time a positive result
came of the affair: Heisenberg's reaction induced Bohr to formulate his own views on the
subject, which ultimately led to the so-called Copenhagen Interpretation of quantum
For what happened next, click Quantum Mechanic.
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