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This book describes the methods of experimental spectroscopy and their use in the study of physical phenomena. The applications of optical spectroscopy may be grouped under three broad headings: chemical analysis, elucidation of atomic and molecular structure, and investigations of the interactions of radiating atoms and molecules with their environment. I have used the word 'Spectro physics' for the third of these by analogy with spectrochemistry for the first and in preference to 'quantitative spectroscopy'. A number of textbooks treat atomic and molecular structure at varying levels of profundity, but elementary spectrophysics is not, so far as I am aware, covered in anyone existing book. There is moreover a lack of up-to-date books on experimental techniques that treat in a fairly elementary fashion interfero metric, Fourier transform and radiofrequency methods as well as prism and grating spectroscopy. In view of the importance of spectrophysics in astrophys ics and plasma physics as well as in atomic and molecular spectroscopy there seemed a place for a book describing both the experimental methods and their spectrophysical applications.
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Henry Trotter was commissioned into the Royal Engineers in 1860 at the age of 18. Two years later he sailed to India and served for the next 13 years on the Great Trigonometrical Survey. In 1873 he took charge of the 'Pundits' the clandestine native explorers employed by the Survey, and in the same year he joined as 'Geographer' the Mission to Yarkand in Xinjiang led by Sir Douglas Forsyth. This was the most ambitious and well-equipped mission ever despatched over the Himalayas, culminating in exploring the unknown Pamirs and the headwaters of the Oxus River. It was here that Trotter made his greatest contributions to geographical science, subsequently being awarded the Patron's Gold Medal b...