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Bohr and Dirac* GENERAL ARTICLE Bohr and Dirac* N Mukunda We present an account of the work of Niels Bohr and Paul Dirac, their interactions and personal- ities. 1. Introduction In this essay I would like to convey to my readers some- thing about the personalities and work of Niels Bohr and Paul Dirac, juxtaposed against one another. Let me N Mukunda – his interests are classical and quantum hope that the portraits I will paint of these two great mechanics, theoretical ¯gures from the world of physics will be faithful to the optics and mathematical originals. The year 1985 was celebrated as the centenary physics. of Bohr's birth, while Dirac passed away in October of the previous year. There was a gap of almost a gener- ation between them. Let us also recall that Einstein's life spanned the period 1879 to 1955; so he was just six * Based on a talk at a meeting of years older than Bohr. the Indian National Science Academy on August 2, 1985. For Bohr and Dirac, the most important work of their lives was bound up with the strange story of the quantum{the struggle to adapt and alter the fabric of classical physics to accommodate Planck's quantum of action. This called for an overhauling of all three com- ponents of the classical scheme{matter, motion and ra- Reproduced with permission diation. Naturally Bohr appeared on the scene at an from Images of Twentieth Cen- tury Physics by N Mukunda, earlier phase of the struggle than did Dirac, and several Universities Press (India) Lim- others were also involved, but here our focus will be on ited, 2000. these two. 2. Planck's Interpolation Some of you may remember that Planck made his mo- mentous discovery sometime in the evening of Sunday, October 7, 1900 (incidentally, Bohr's ¯fteenth birth- Keywords day). The experimental physicist Heinrich Rubens and Bohr atom, Old Quantum his wife had visited the Plancks for tea that afternoon. Theory, quantum mechanics. RESONANCE October 2013 917 GENERAL ARTICLE The quantum of action Rubens told Planck of his and Kurlbaum's measure- was thus first ments of the black-body radiation spectrum in the far in- discovered via the frared limit, where he had found de¯nite deviations from thermodynamic the Wien radiation law. This law was a theoretical one properties of light, and which had been proposed in 1896 by Wien, and which in the succeeding Planck had believed to be exactly valid. Soon after the years the first insights Rubens left, Planck set to work to ¯nd an interpolation into its significance between Wien's Law, known to be valid at high frequen- came largely through cies, and the low frequency measurements just reported statistical arguments to him by Rubens, which incidentally agreed with the as well as the wave– theoretical results of Rayleigh and Jeans. It was thus particle duality of light. that Planck arrived at his celebrated radiation law. It is somewhat staggering to realise that quantum theory was born or discovered in this way in the space of a few hours! The quantum of action was thus ¯rst discovered via the thermodynamic properties of light, and in the suc- ceeding years the ¯rst insights into its signi¯cance came largely through statistical arguments as well as the wave{ particle duality of light. In all of this, of course, Ein- stein played a leading role. However, the connection of Planck's discovery to the structure of matter, its stabil- ity and its mechanics had to wait for Bohr's magic touch in the years 1912{13. 3. Bohr at Cambridge and Manchester During his doctoral work on the electron theory of met- als, completed in 1911, Bohr had realised very clearly that there was a need for a radical departure from the The connection of laws of classical electrodynamics in the atomic domain. Planck’s discovery to It was extremely fortunate for him that in April 1912 the structure of he went to work brie°y with Rutherford at Manchester, matter, its stability and after a disappointing stint with J J Thomson at Cam- its mechanics had to bridge. At Manchester he came to know of Ruther- wait for Bohr’s magic ford 's model of the atom in which the positively charged touch in the years core of the atom, the nucleus, containing practically all the mass, occupied a negligible volume at the centre of 1912–13. 918 RESONANCE October 2013 GENERAL ARTICLE the atom. This was in contrast to Thomson's model, in Bohr saw that while which the positive charge was spread out uniformly over chemistry was a ¯nite volume of atomic dimensions. Many problems determined by the and possibilities immediately became clear to Bohr. On outermost electrons of the one hand, in order to produce in this model a length the atom, all scale of the order of the atomic size, and also to en- radioactive processes sure stability of the electron orbits, it was essential to like and emission bring in Planck's constant. On the other hand, it now originated from the appeared that all the chemical properties of an element nucleus, deep inside should depend only on one datum, namely the number the atom. of peripheral electrons, i.e., the atomic number rather than the mass number. In fact, Bohr saw that while chemistry was determined by the outermost electrons of the atom, all radioactive processes like ® and ¯ emission originated from the nucleus, deep inside the atom. It ap- pears that at this stage Bohr took Rutherford's model more seriously than Rutherford himself did. Turning to the structure of the atom, Bohr assumed that the electrons moved in concentric circular rings around the nucleus. Classical electrodynamics could never ex- plain the stability of such an arrangement; but Bohr had already anticipated the need for a fundamental depar- ture from classical ideas in this realm. He was familiar with Planck's method of quantizing the motion and the energy of simple harmonic motion, and he now adapted it to the motion of an electron in the Coulomb ¯eld of the nucleus. As much by inspiration as by deduction he was able to arrive at the right order of magnitude 2 for atomic sizes, and at the expression En = A=n for the allowed energies of an electron bound in¡an atom. Here the integer n takes values 1; 2; 3; . For all this of course, Planck's constant was essent¢i¢a¢l, but at that time the exact form of the quantum condition was be- yond him. At this stage another important event occurred { he was called upon to investigate the passage of ®-particles through matter and to analyze the processes by which RESONANCE October 2013 919 GENERAL ARTICLE they ionized the atoms of matter, losing energy and slow- ing down as they did so. This was a matter of prac- tical importance in Rutherford's laboratory. The fact that he could give a satisfactory classical account of this process, whereas classical ideas failed completely within the atom, led him to the following truth: however deep the break with classical ideas might be, the new theory would have to agree with the old one in the limit of low frequencies or large quantum numbers. This was the origin of the famous Correspondence Principle, which played such a major part in subsequent developments. 4. Connection to Rydberg's Formula At this point in his thinking, Bohr had dealt only with the structure and stability of the atom, and had not yet connected up with atomic spectroscopy or radiation phe- nomena. He returned from Manchester to Copenhagen in July 1912, married Margrethe Norlund in August 1912, and set about writing up the ideas conceived in Manchester. It was only in early 1913 that his mind sud- denly turned to problems of atomic radiation. Atomic spectroscopy was a well-developed ¯eld with a lot of data on the characteristic spectral lines and frequencies asso- ciated with various elements. There also existed several empirical formulae, giving simple expressions for many series of spectral lines. H M Hansen, a colleague of Bohr's at the University of Copenhagen, asked him in early 1913 if he knew of Rydberg's formula which ex- pressed every frequency as the di®erence of two terms, and which for hydrogen took the simple form 1 1 º = R mn n2 ¡ m2 µ ¶ where both n and m were integers. Bohr had not known this even though it had been around since 1890, and Rydberg worked at the nearby University of Lund in southern Sweden. So this query and information from 920 RESONANCE October 2013 GENERAL ARTICLE Hansen came as a complete surprise to Bohr. But at In the Planck– the same time he saw that it gave the missing clue to Einstein spirit, it was the problem of quantization in the atom. He compared Bohr who first saw the 2 his own formula E = A=n for quantized electron Rydberg law as an n ¡ energies in an atom with individual terms in Rydberg's expression of the expression and immediately realized that each spectral conservation of line corresponded to a transition of an electron from one energy. allowed state to another, accompanied by the emission of a quantum of radiation. In the Planck{Einstein spirit, it was Bohr who ¯rst saw the Rydberg law as an expression of the conservation of energy, hº = E E ; E = hR=m2 : mn m ¡ n m ¡ By demanding agreement with classical theory for large n, Bohr was able to completely pin down the quantiza- tion condition as well as to calculate the value of Ryd- berg's constant.
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