Molecular Beams with Energies above One Electron Volt

Abuaf, N.; Anderson, James B.; Andres, R. P.; Fenn, John B.; Marsden, Dan

doi:10.1126/science.155.3765.997

Cited by 95 publications

(31 citation statements)

References 10 publications

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“…The vast majority of surface studies had been and still are undertaken after adsorption of gas molecules from the ambient background where molecules strike the surface with thermally distributed energies. However, with the development of molecular beam techniques (3,4), it became possible to investigate the effect of the incident energy. These techniques were first applied to the problem of dissociative chemisorption in the early 1970s (5, 6) but, despite these elegant experiments which clearly demonstrated the direct, activated dissociative chemisorption mechanism of LennardJones, the importance of a molecule's incident energy was not widely appreciated or studied until the mid-1980s.…”

mentioning

confidence: 99%

New Mechanisms for Chemistry at Surfaces

Ceyer

1990

Science

167

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It is becoming increasingly apparent that chemistry at surfaces, whether it be heterogeneous catalysis, semiconductors etching, or chemical vapor deposition, is controlled by much more than the nature and structure of the surface. Recent experiments that principally make use of molecular beam techniques have revealed that the energy at which an incident molecule collides with a surface can be the key factor in determining its reactivity with or on the surface. In addition, the collision energy of an incident particle has proven essential to the finding of new mechanisms for reaction or desorption of molecules at surfaces, collision-induced activation and collision-induced desorption. These phenomena are often responsible for the different surface chemistry observed under conditions of high reactant pressure, such as those present during a heterogeneous catalytic reaction, and of low pressure of reactants (< 10(-4) torr), such as those present in an ultrahigh vacuum surface science experiment. This knowledge of the microscopic origins of the effect of pressure on the chemistry at surfaces has allowed the development of a scheme to bypass the high-pressure requirement. Reactions that are normally observed only at high reactant pressures, and which are the ones most often of practical importance, can now be carried out in low-pressure, ultrahigh vacuum environments.

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confidence: 99%

New Mechanisms for Chemistry at Surfaces

Ceyer

1990

Science

167

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“…It was actually John Fenn, in his measurements on the velocity distribution of these beams, who unambiguously demonstrated this approach for making high energy beams to be simpler and more versatile. 7 Our efforts to manipulate the velocity of neutral polar molecules were originally inspired by both the exquisite control that was available over the motion of atoms and the simultaneous lack of a similar level of control for-arguably more interesting-molecules. We have been exploring the possibilities to manipulate molecular motion with electric fields, and have focused on the production of molecules with a sufficiently low kinetic energy that can be stored in a DC 8 or AC 9 electric trap, or in a storage ring.…”

Section: Introductionmentioning

confidence: 99%

Molecular beams with a tunable velocity

Heiner

Bethlem

Meijer

2006

Phys. Chem. Chem. Phys.

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The merging of molecular beam methods with those of accelerator physics has yielded new tools to manipulate the motion of molecules. Over the last few years, decelerators, lenses, bunchers, traps, and storage rings for neutral molecules have been demonstrated. Molecular beams with a tunable velocity and with a tunable width of the velocity distribution can now be produced, and are expected to become a valuable tool in a variety of physical chemistry and chemical physics experiments. Here we present a compact molecular beam machine, capable of producing 3D-spatially focused packets of state-selected accelerated or decelerated molecules

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“…A key element in Dole's 1968 experiment [16] was the assumption that he knew the velocity of the polystyrene nmers exiting the needle; an assumption based on work that Fenn had reported a year earlier [19] and which Dole had referenced. Dole published two additional papers on his research in this area [17,20] while at Northwestern.…”

Section: A Second Serendipitous Meetingmentioning

confidence: 99%

John Bennett Fenn: A Curious Road to the Prize

Grayson

2011

J. Am. Soc. Mass Spectrom.

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John Bennett Fenn shared the 2002 Nobel Prize in Chemistry for his development of electrospray ionization (ESI). There are several excellent, in-depth biographical reviews of Fenn's scientific career Fenn (Angew. Chem., Int. Ed. 42, 3871-3894, 2003) and Fenn (Annu. Rev. Phys. Chem. 47, 1-41, 1996). The focus of this report is to trace the random walk nature of Fenn's career path and to highlight those critical events along that path that led him to the important work for which he was recognized, the development of ESI as a means of ionizing large molecules and interfacing the liquid chromatograph to the mass spectrometer. In addition, this report should hopefully convey something of the curious, generous, kind, and outgoing nature of the man.

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Molecular Beams with Energies above One Electron Volt

Cited by 95 publications

References 10 publications

New Mechanisms for Chemistry at Surfaces

New Mechanisms for Chemistry at Surfaces

Molecular beams with a tunable velocity

John Bennett Fenn: A Curious Road to the Prize

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