Keith B. MacAdam

Millimeter-wave spectroscopy of Zn I in1D2,1F3and1G4Rydberg states

A. S. Kutsenko, Keith B. MacAdam, Stanislav F. Dyubko, N. L. Pogrebnyak

We have measured the frequencies of 24 transitions between Rydberg singlet L = 2–4 levels of zinc in the frequency range 79–285 GHz. The transitions were driven from 4s n f 1 F 3 levels that were excited by two-step laser excitation …

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Laser-microwave spectroscopy of singlet Mg I atoms in S,P,D,F,G Rydberg state

Stanislav F. Dyubko, V. A. Efremov, A. S. Kutsenko, N. L. Pogrebnyak et autres

For the first time the energy level positions of Mg I atoms have been measured with high accuracy by means of laser-microwave spectroscopy in the 79-234 GHz frequency range. The new measurements cover the range of principal quantum number n=25-40 in L=0-4 …

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Electron-helium free-free scattering in the presence of a laser field

B.A. deHarak, L. Ladino, Keith B. MacAdam, Nicholas L S Martin

We report measurements of the scattering of electrons by helium atoms in the presence of 1.17 eV photons from a Nd:YAG laser. The incident energy of the electrons was in the range 50 – 350 eV and the polarization of the laser …

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Microwave spectroscopy of singlet Mg I inL= 0–4 Rydberg states

Keith B. MacAdam, Stanislav F. Dyubko, V. A. Efremov, A. S. Kutsenko et autres

Microwave resonances among high-lying spin-singlet Rydberg levels in neutral Mg have been measured with approximately 1 MHz accuracy for principal quantum numbers n = 25–40 and orbital angular momentum L = 0–4. P, D and F levels were excited by multistep laser …

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High-energy electron-helium scattering in a Nd:YAG laser field

B.A. deHarak, L. Ladino, Keith B. MacAdam, Nicholas L S Martin

We report measurements of the scattering of electrons by helium atoms in the presence of 1.17 eV photons from a Nd:YAG laser. The incident energy of the electrons was in the range 50--350 eV, and the polarization of the laser was arranged …

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Laser-microwave spectroscopy of Au I atoms in F rydberg state

Stanislav F. Dyubko, V. A. Efremov, V. G. Gerasimov, M. N. Efimenko et autres

For the first time the energy level positions of Au I atoms have been measured with high accuracy by means of laser-microwave spectroscopy in the 176-211 GHz frequency range. The new measurements cover the range of principal quantum number n=31-34 for Rydberg …

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Laser-microwave spectroscopy of Cu I atoms in S, P, D, F and G Rydberg states

Keith B. MacAdam, Stanislav F. Dyubko, V. A. Efremov, V. G. Gerasimov et autres

Energy-level positions of neutral copper atoms in S, P, D, F and G Rydberg series for principal quantum number n = 23–38 have been determined with sub-MHz accuracy by means of laser-microwave spectroscopy in the 73–321 GHz frequency range. Quantum defects of …

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Microwave spectroscopy of Ag I atoms in Rydberg states: S, P and D terms

Keith B. MacAdam, Stanislav F. Dyubko, V. A. Efremov, V. G. Gerasimov et autres

Microwave resonance transitions of Ag I atoms laser excited to Rydberg S, P and D states of the configuration 4d 10 n ℓ, for n = 28–39, were measured with MHz accuracy at frequencies from 76 to 363 GHz. Quantum defects and …

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Uncertainties in theoretical He i emissivities: H ii regions, primordial abundance and cosmological recombination

Ryan L. Porter, G. J. Ferland, Keith B. MacAdam, Peter J. Storey

Abstract A number of recent works in astronomy and cosmology have relied upon theoretical He i emissivities, but we know of no effort to quantify the uncertainties in the atomic data. We analyse and assign uncertainties to all relevant atomic data, perform …

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Laser-microwave spectroscopy of Cu I atoms in S Rydberg state

Stanislav F. Dyubko, V. A. Efremov, V. G. Gerasimov, M. N. Efimenko et autres

For the first time the energy level positions of Cu I atoms have been measured with high accuracy by means of laser-microwave spectroscopy in the 77-136 GHz frequency range. The new measurements cover the range of principal quantum number n = 31-38 …

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Electron impact autoionization in the presence of a laser field

B.A. deHarak, K.D. Wells, Keith B. MacAdam, Nicholas L S Martin

A narrow-band tunable diode laser system with grating feedback, and a saturated absorption spectrometer for Cs and Rb

Keith B. MacAdam, Andy Steinbach, Carl Wieman

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