Laser Sources

Leone, Stephen R.; Moore, C. Bradley

doi:10.1016/b978-0-12-505401-0.50006-7

Cited by 2 publications

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References 114 publications

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“…There were few results or methods for making further measurements. In the early sixties, fixed-frequency lasers began to be useful sources for spectroscopic experiments (33)(34)(35). Therefore, I was constantly looking for, and experimenting with, lasers that might be useful for exciting molecular vibrations.…”

Section: Lasers and V → V Energy Transfermentioning

confidence: 99%

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A Spectroscopist's View of Energy States, Energy Transfers, and Chemical Reactions

Moore

2007

Annu. Rev. Phys. Chem.

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This chapter describes a research career beginning at Berkeley in 1960, shortly after Sputnik and the invention of the laser. Following thesis work on vibrational spectroscopy and the chemical reactivity of small molecules, we studied vibrational energy transfers in my own lab. Collision-induced transfers among vibrations of a single molecule, from one molecule to another, and from vibration to rotation and translation were elucidated. My research group also studied the competition between vibrational relaxation and chemical reaction for potentially reactive collisions with one molecule vibrationally excited. Lasers were used to enrich isotopes by the excitation of a predissociative transition of a selected isotopomer. We also tested the hypotheses of transition-state theory for unimolecular reactions of ketene, formaldehyde, and formyl fluoride by (a) resolving individual molecular eigenstates above a dissociation threshold, (b) locating vibrational levels at the transition state, (c) observing quantum resonances in the barrier region for motion along a reaction coordinate, and (d) studying energy release to fragments. GETTING STARTEDI had the good fortune to grow up on a farm in eastern Pennsylvania, where hard work produced good crops, poultry, and livestock; where I could help my father take apart, repair, and reassemble farm equipment; and where I could manufacture and experiment with gun powder. In those days, parents could still give chemistry sets to their children, and the East Coast sky was often clear enough to observe shooting stars while lying flat on the bed of a hay wagon. This constituted my first spectroscopic observations of chemistry in action. My initial in-class chemistry lab was a study of sulfur combustion carried out by placing a fumigation candle in the ink well of my third-grade desk and lighting it on departure for recess. This early initiative was not encouraged on my return from the playground. One of Princeton Professor Hubert Alyea's renowned lectures on the marvels of chemistry at a nearby high school provided my first look at cryogenics as he exhaled through a mouth full of dry ice. By the time I finished a series of integrated courses in the physical sciences, a one-week visit by J. Robert Oppenheimer, and a challenging course in analytical/inorganic chemistry in high school (Phillips Exeter Academy in New Hampshire), I was well on my way to becoming a physical chemist. The launching of Sputnik during my first month of college (October 1957) at Harvard sharply increased federal funding for scientific research and greatly encouraged scientific career paths. That fall, the intensity of lab courses in physics and organic chemistry, a fourth-semester calculus course, and a humanities course quickly ended my aspiration to extend my high-school crew experience to intercollegiate rowing. A series of research projects in Paul D. Bartlett's personal lab at Harvard and summer jobs at Arthur D. Little and General Electric's corporate research lab deepened my interest and experi...

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Section: Lasers and V → V Energy Transfermentioning

confidence: 99%

“…fundamentals and the combination and overtone vibrations of heavier atoms to direct study (35,71). Energy-transfer paths were studied in depth in CO (72), HCl(v = 2) (67, 73), methane (41,42), water (74)(75)(76), carbon dioxide and nitrous oxide (77), and their isotopomers.…”

Section: Wwwannualreviewsorg • Energy Transfers and Chemical Reactimentioning

confidence: 99%

A Spectroscopist's View of Energy States, Energy Transfers, and Chemical Reactions

Moore

2007

Annu. Rev. Phys. Chem.

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Use of a High Intensity Dye Laser to Produce Singlet Oxygen*

Koroll

Singh

1978

Photochem & Photobiology

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Abstract— A coaxial, flashlamp‐pumped, dye laser is being used to directly excite ground state oxygen at high pressures (˜150atm, ˜15MPa), to singlet oxygen. The parameters of the laser beam are as follows: pulse width, ˜350ns; beam diameter, ˜18 mm; beam energy, ˜3J/pulse (at 590 nm using Rhodamine 6G in ethanol as the dye). The laser can be tuned to produce light beams at most of the wavelengths at which oxygen shows optical absorption. Singlet oxygen has been produced in solutions of oxygen (˜15 MPa) in Freon‐113 and CCl4 by irradiation at 477, 575 and 632 nm.

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Laser Sources

Cited by 2 publications

References 114 publications

A Spectroscopist's View of Energy States, Energy Transfers, and Chemical Reactions

A Spectroscopist's View of Energy States, Energy Transfers, and Chemical Reactions

Use of a High Intensity Dye Laser to Produce Singlet Oxygen*

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