STIMULATED ELECTRON-ION (ELECTRON-ATOM) RECOMBINATION AT A RESONANCE

STIMULATED EMISSION BASED ON TWO-STEP HYBRID RESONANCE $A^{1}\Sigma_{u}^{+}$ OR $B^{1}\Pi_{u}$ STATE OF $Na.^{*}$ STIMULATED EMISSION BASED ON TWO-STEP HYBRID RESONANCE $A^{1}\Sigma_{u}^{+}$ OR $B^{1}\Pi_{u}$ STATE OF $Na.^{*}$

L. J. Qin, Z. G. Wang, K. C. Zhang +1 more

The first step of the hybrid excitation in the experiment was achieved by using a pulse broadband ($\\sim$200 {\\AA}) dye laser beam through a heat pipe oven. But the total covered pumping wavelength region from 4600 {\\AA} to 6800 {\\AA} the populated upper electronic state in $Na_{2}$ should be either $A^{\\prime}\\Sigma_{u}$ or $B^{\\prime}\\Pi_{u}$ state. The excited sodium dimers $Na_{2}^{\\ast}$ transfered their energy to sodium atoms Na by near resonace collisions and the Na then would populate up the 3P level from ground state 3s. The Na were consequentely pumped up to 4D, 5D, 5S or 6S level from 3P by using a narrowband dye laser pumped by the same $N_{2}$ laser. The infrared stimulated radiation corresponding to the transitions of 4D-4P(2.34 $\\mu$ m). 5D-4P(5.02 $\\mu$ m), 5S-4P(3.42 $\\mu$ m) and 6S-5P(7.52 $\\mu$ m) with cascade stimulated emission from 4P to 4S (2.20 $\\mu$ m) and from 5P to 5S (5.43 $\\mu$ m) were then obtained, Furthermore the dependence of the output energy on the pumping wavelengthes was measured and discussed.The first step of the hybrid excitation in the experiment was achieved by using a pulse broadband ($\\sim$200 {\\AA}) dye laser beam through a heat pipe oven. But the total covered pumping wavelength region from 4600 {\\AA} to 6800 {\\AA} the populated upper electronic state in $Na_{2}$ should be either $A^{\\prime}\\Sigma_{u}$ or $B^{\\prime}\\Pi_{u}$ state. The excited sodium dimers $Na_{2}^{\\ast}$ transfered their energy to sodium atoms Na by near resonace collisions and the Na then would populate up the 3P level from ground state 3s. The Na were consequentely pumped up to 4D, 5D, 5S or 6S level from 3P by using a narrowband dye laser pumped by the same $N_{2}$ laser. The infrared stimulated radiation corresponding to the transitions of 4D-4P(2.34 $\\mu$m). 5D-4P(5.02$\\mu$m), 5S-4P(3.42 $\\mu$m) and 6S-5P(7.52 $\\mu$m) with cascade stimulated emission from 4P to 4S (2.20 $\\mu$m) and from 5P to 5S (5.43 $\\mu$m) were then obtained, Furthermore the dependence of the output energy on the pumping wavelengthes was measured and discussed.

Jan 1, 19850 citations

Resonance ionization of atoms

Alexey E. Kazakov, Vyacheslav P. Makarov, Mikhail Vladimirovich Fedorov

Journal of Experimental and Theoretical PhysicsJan 1, 19762 citations

Electron-Atom Resonances

Frank H. Read

Kluwer Academic Publishers eBooksDec 15, 20050 citations

SELECTIVE POPULATION OF MOLECULAR CORE NONPENETRATING RYDBERG STATES

David Grimes, Robert W. Field, Ethan Klein +2 more

"Core nonpenetrating Rydberg states of molecules are a neglected state of matter. They could have a variety of uses, notably state-selective production of molecular ions. Due to the \textit{l}(\textit{l}+1)/r $^{2}$ centrifugal barrier that prevents the Rydberg electron in high-\textit{l} states from penetrating inside of the ion core, the electron is essentially uncoupled from the ion core, and the system becomes atom-like with long lifetimes, an ""almost good"" \textit{l} quantum number, and electronic transitions that follow $\Delta$ J $^{+}$ =0 and $\Delta$ v $^{+}$ =0 propensity rules. However, in most molecules access to these states, via a sequence of $\Delta$ \textit{l}=+1 transitions from low-n*, low-\textit{l} states, is blocked by the necessity to traverse the ""zone of death,"" in which nonradiative decay mechanisms are prohibitively fast. We exploit Chirped Pulse millimeter-Wave (CPmmW) spectroscopy to efficiently excite Ca atoms and BaF molecules to core nonpenetrating states in the absence of nonradiative decay mechanisms. A universal method for preparing core nonpenetrating Rydberg states of molecules, which combines CPmmW spectroscopy with STImulated Raman Adiabatic Passage (STIRAP), will be discussed.""Core nonpenetrating Rydberg states of molecules are a neglected state of matter. They could have a variety of uses, notably state-selective production of molecular ions. Due to the \textit{l}(\textit{l}+1)/r$^{2}$ centrifugal barrier that prevents the Rydberg electron in high-\textit{l} states from penetrating inside of the ion core, the electron is essentially uncoupled from the ion core, and the system becomes atom-like with long lifetimes, an ""almost good"" \textit{l} quantum number, and electronic transitions that follow $\Delta$J$^{+}$=0 and $\Delta$v$^{+}$=0 propensity rules. However, in most molecules access to these states, via a sequence of $\Delta$\textit{l}=+1 transitions from low-n*, low-\textit{l} states, is blocked by the necessity to traverse the ""zone of death,"" in which nonradiative decay mechanisms are prohibitively fast. We exploit Chirped Pulse millimeter-Wave (CPmmW) spectroscopy to efficiently excite Ca atoms and BaF molecules to core nonpenetrating states in the absence of nonradiative decay mechanisms. A universal method for preparing core nonpenetrating Rydberg states of molecules, which combines CPmmW spectroscopy with STImulated Raman Adiabatic Passage (STIRAP), will be discussed."

International Symposium on Molecular Spectroscopy (ISMS)Jun 19, 20140 citations

LASER–INDUCED EXCITED ATOM DYNAMICS: STIMULATED, ELECTRON SHELVING AND ATOM–SURFACE INDUCED PROCESSES

Constantine Mavroyannis

Advances in multi-photon processes and spectroscopyJul 1, 19890 citations

Stimulated Recombination of Atoms and Optical Polarization of Nuclei

David F. Zaretsky, É. A. Nersesov

Contributed toJan 1, 19930 citations

STIMULATED EMISSION BASED ON TWO-STEP HYBRID RESONANCE

A^{1}\Sigma_{u}^{+}

B^{1}\Pi_{u}

STATE OF

Na.^{*}

Na_{2}

should be either

A^{\\prime}\\Sigma_{u}

B^{\\prime}\\Pi_{u}

state. The excited sodium dimers

Na_{2}^{\\ast}

transfered their energy to sodium atoms Na by near resonace collisions and the Na then would populate up the 3P level from ground state 3s. The Na were consequentely pumped up to 4D, 5D, 5S or 6S level from 3P by using a narrowband dye laser pumped by the same

N_{2}

laser. The infrared stimulated radiation corresponding to the transitions of 4D-4P(2.34

\\mu

m). 5D-4P(5.02

\\mu

m), 5S-4P(3.42

\\mu

m) and 6S-5P(7.52

\\mu

m) with cascade stimulated emission from 4P to 4S (2.20

\\mu

m) and from 5P to 5S (5.43

\\mu

m) were then obtained, Furthermore the dependence of the output energy on the pumping wavelengthes was measured and discussed.

^{2}

centrifugal barrier that prevents the Rydberg electron in high-\textit{l} states from penetrating inside of the ion core, the electron is essentially uncoupled from the ion core, and the system becomes atom-like with long lifetimes, an ""almost good"" \textit{l} quantum number, and electronic transitions that follow

\Delta

^{+}

=0 and

\Delta

^{+}

=0 propensity rules. However, in most molecules access to these states, via a sequence of

\Delta

\textit{l}=+1 transitions from low-n*, low-\textit{l} states, is blocked by the necessity to traverse the ""zone of death,"" in which nonradiative decay mechanisms are prohibitively fast. We exploit Chirped Pulse millimeter-Wave (CPmmW) spectroscopy to efficiently excite Ca atoms and BaF molecules to core nonpenetrating states in the absence of nonradiative decay mechanisms. A universal method for preparing core nonpenetrating Rydberg states of molecules, which combines CPmmW spectroscopy with STImulated Raman Adiabatic Passage (STIRAP), will be discussed."