Effect of added broadband noise on microwave {open_quotes}ionization{close_quotes} of 3d H atoms: Experiment vs. calculations

Journal Article · Sat May 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:281222

Koch, P M; Sirko, L; Bellermann, M; Haffmans, A ^[1]

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1. and others

3d H(n{sub 0}) atoms were exposed to a 4.3 ns long, half-sinewave pulse of microwave field in a 26-40 GHz waveguide, with most data taken at 30.36 GHz; use of n{sub 0}=54,...,72 covered the scaled frequency range n{sub 0}{sup 3}{omega}=0.727-1.72. TWTA 26-40 GHz shot noise rms amplitudes 0.5,0.8,1.4,2.2 V/cm were used. We saw cases when 10%-{open_quotes}ionization{close_quotes} (n{sub c} {approx_equal} 89) thresholds F(10%) for some n{sub 0}`s were (1) strongly decreased by noise; (2) were little affected; (3) were increased. Classical 3d Monte Carlo calculations modeling the added noise reproduce many but not all of our F(10%) data. Quantal 1d calculations reproduce the sensitivity to noise of e.g., (1), where nonclassical local stability for weak noise is caused by {open_quotes}sparred{close_quotes} wavefunctions. Our work shows added noise to be a spectroscopic tool for identifying scarred and other novel quantal states of a strongly periodically driven system.

• OSTI ID: 281222
• Report Number(s): CONF-9305421--; CNN: Grant PHY-8922506
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 38; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HAMILTONIANS
HYDROGEN
MICROWAVE RADIATION
MONTE CARLO METHOD
NOISE
PHOTOIONIZATION