A History of Thermo Jarrell Ash Corporation and Spectroscopist Richard F. Jarrell

Abstract

Around the time Maurice Hasler was building a spectrograph for use in his then-new Applied Research Laboratories in California, and about a year before Walter Baird started his namesake company just outside of Boston, Richard F. Jarrell was finishing up his four-year degree in Physics at the Massachusetts Institute of Technology. His father, J. O. Jarrell (who disliked and seldom used his given name, Joshua Oscar), had an established business in Boston selling microscopes and other optical goods. The elder Jarrell was taking on a new product line: spectrographs and other analytical instruments from London-based Adam Hilger Limited. He arranged for Dick, his oldest son, to spend the summer at Hilger learning firsthand as much as possible about their instrumentation. That trip, followed by a graduate fellowship project at MIT, set the stage for Jarrell's life in science and business-and for a spectroscopy company that still carries his name.

Physics of cuprates with the two-band Hubbard model: The validity of the one-band Hubbard model

“…When the Cu-O hybridization t pd is switched on, the extra holes added to the oxygen band will scatter with the Cu spins and bound states will appear at the bottom of the oxygen band. This is illustrated by the solid line, which plots the partial d DOS which was obtained using the Maximum Entropy Method (MEM) 24 for the analytic continuation of the QMC data to real frequencies. It can be noticed that the first hole addition states have a strongly mixed d and p character (the d character in the spectrum is large now) and an energy pushed well below the edge of the initial non-bonding oxygen band.…”

Experimentos simples usando fotometria de chama para ensino de princípios de espectrometria atômica em cursos de química analítica

“…No caso da espectroscopia atômica, devido à sua grande relevância para o avanço das ciências naturais, há vários textos relacionados com o tema, destacando-se os de Jarrell 6 , que apresenta um histórico da análise por emissão atômi-ca entre 1660-1950, o livro de Lajunen 2 sobre análise espectroquímica por emissão e absorção atômicas e o artigo de Filgueiras 7 sobre as relações da espectroscopia e a química, entre inúmeros outros. Os parágrafos abaixo são um resumo do que citam estes autores 2,6,7 . Tais textos destacaram a teoria corpuscular da luz de Isaac Newton (1666), que foi o primeiro a observar a decomposição da luz branca ao incidir em um prisma, resultando no aparecimento de diferentes cores, o que o levou a supor que a luz seria composta de partículas minúsculas, que se deslocariam em altas velocidades.…”