Atomic shells (repost)

I wrote the following post for the now-defunct in November 2014. But I enjoyed writing and rereading it so much that I wanted to preserve it here.

Like a lot of us, I’m applying for jobs. In practical terms, that means I have been firing a lot of PDFs into the cloud, with no reason to believe that anyone will ever read them. Months go by with nary an automatic email of receipt. So when, one recent day, I heard from an institution’s search committee, my surprise was so complete that my mind could only grasp its dimensions through an analogy. Or, more precisely, through an analogy to an analogy.

What immediately popped into my head was a famous description of a rather more important shock in the history of science: Ernest Rutherford’s astonishment that alpha particles—today aka helium nuclei—reflected off a piece of gold foil. Being told of the reflection “‘was quite the most incredible event that has ever happened to me in my life,” Rutherford said in one of his last recorded lectures (he died in 1937). “It was almost as incredible as if you fired a 15-inch shell at a piece of tissue paper and it came back and hit you.”

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