Purcell, Edward

Proton-transfer reactions. See Acid-base reactions Pseudoionone, 1049 Purcell, Edward, 490 Purine(s), 431, 1090-1091... 

Purcell, Edward M. 1964. Nuclear physics without the neutron clues and contradictions. Proceedings of the Tenth Annual Congress of the History of Science. Hermann. Rabi, I. I. 1945. The physicist returns from the war. Atlantic. Oct. 

Przybytek Michal, 154 Pulay Peter, 648 Purcell Edward M., 771, 772... 

Nuclear magnetic resonance of protons was first detected in 1946 by Edward Purcell (Harvard) and by Felix Bloch (Stanford) Purcell and Bloch shared the 1952 Nobel Prize in physics... 

Nuclear magnetic resonance is another characterisation technique of great practical importance, and yet another that became associated with a Nobel Prize for Physics, in 1952, jointly awarded to the American pioneers, Edward Purcell and Felix Bloch (see Purcell et at. 1946, Bloch 1946). In crude outline, when a sample is placed in a strong, homogeneous and constant magnetic field and a small radiofrequency magnetic field is superimposed, under appropriate circumstances the... 

The January and February 1946 issues of the scientific journal Physical Reviews featured two independent research reports by Felix Bloch of Stanford and Edward Purcell of Harvard. The articles, The Nuclear Induction Experiment and Resonance Absorption by Nuclear Magnetic Moments in a Sohd, weren t bedtime reading. They described work that would seem to be... 

NMR spectroscopy is probably the most powerful research tool used in structural chemical investigations today. It was first described independently by Felix Bloch (paraffin, 30 MFIz) and Edward Mills Purcell (water, 8 MFIz) in 1945/1946. They shared the Nobel Prize in Physics in 1952 for their discovery. Atomic nuclei experience this phenomenon if they possess a spin the nuclei of some elements possess a net magnetic moment (ji), viz. in the case that the spin (T) of the nucleus is non-zero. This condition is met if the mass number and the atom number of the nucleus are not both even (as is the case for 12C and 160). 

Often the question is asked, Is NMR harmful There is a story told by Nobel Prize winner and Professor of Physics Edward Purcell of Harvard that about the time the university s cyclotron was being constructed, he wondered whether a person could sense the tipping and forced precession of proton spins in his or her own brain. The perfect opportunity arose just as the huge cyclotron magnets had been completed but before the vacuum chamber had been inserted into the magnet gap. He and a colleague constructed an rf coil in the gap one of them placed his head in the coil, while the other connected an oscillator and tuned it to the proton Larmor frequency. Purcell reports that neither physicist could tell when his brain passed in and out of resonance. That undoubtedly marks the first NMR experiment on human subjects, and no untoward... 

The discovery of magnetic resonance in bulk matter opened up a very active area of physical research. It has been applied to physical and chemical problems by physicists and chemists all over the world to the present day. In recognition of their work, Edward Purcell and Felix Bloch received the 1952 Nobel Prize in physics for their discovery of magnetic resonance in bulk matter. 

Figure 14.4 Robert V. Pound, Henry C. Tbrrey, and Edward M. Purcell (left to right) at the retirement of Tbrrey from Rutgers University. This same photograph appeared on a poster celebrating the fiftieth anniversary at Harvard University of the discovery of NMR.

In the meantime. Harvard physicist Edward M. Purcell and his graduate student Harold I. ( Doc ) Ewen were setting up an ex-... 

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