Denis P. Donnelly

Symplectic integrators: An introduction

Symplectic integrators very nearly conserve the total energy and are particularly useful when treating long times. We demonstrate some of the properties of these integrators by exploring the structure of first-, second-, and fourth-order symplectic integrators and apply them to the simple harmonic oscillator. We consider numeric, geometric, and analytic aspects of the integrators with particular attention to the computed energies.

Detection of Metastable Atoms and Molecules with Continuous Channel Electron Multipliers

Detection of metastable He, H, Ne, Ar, Kr, Xe and molecular nitrogen with continuous channel electron multipliers

Effect of recoil on the velocity distribution of metastable atoms produced by electron impact

Supported in part by the National Aeronautics and Space Administration.

Time series analysis with the Hilbert–Huang transform

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Time-of-Flight Experiments in Molecular Motion and Electron-Atom Collision Kinematics.

W. E. Lamb, jr. and R. C. Retherford. Phys. Rev. 79, 549 (1950).

Measuring small vibrations with interferometry

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Slow collisions in the ballistic pendulum: A computational study

W. Lichten, Phys. Rev. 126, 1020 (1962).

Nibbling at A/D in introductory electronics

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Equation‐solving software packages: Uses in the undergraduate curriculum

R. Freund and W. Klemperer, J. Chem. Phys. 47, 2897 (1967); R. Clampitt and A. S. Newton, J. Chem. Phys. 50, 1997 (1969).

The Atmosphere and the Ocean: A Field Study Course

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