Four-photon resonant ionization of mercury

1977 ◽  
Vol 55 (5) ◽  
pp. 434-435 ◽  
Author(s):  
C. Tai ◽  
F. W. Dalby
Keyword(s):  
Laser Light ◽  
Photon Absorption ◽  
Frequency Range ◽  
Resonant Ionization ◽  
Photon Ionization ◽  
Atomic Mercury

Strong photoionization spectra have been observed in atomic mercury following absorption of laser light. In the frequency range 25 500 to 27 800 cm−1 many resonances corresponding to coherent three-photon absorption followed by one-photon ionization are reported.

scholarly journals Characterization of Optically-Reconfigurable Metasurfaces by a Free Space Microwave Bistatic Technique

2020 ◽  
Vol 10 (12) ◽  
pp. 4353
Author(s):  
Houssemeddine Krraoui ◽  
Charlotte Tripon-Canseliet ◽  
Ivan Maksimovic ◽  
Stefan Varault ◽  
Gregoire Pillet ◽  
...  
Keyword(s):  
Near Infrared ◽  
Optical Power ◽  
Frequency Selective Surface ◽  
Infrared Region ◽  
Photon Absorption ◽  
60 Ghz ◽  
Frequency Range ◽  
Specific Incident ◽  
Absorption Phenomenon

Microwave performance extraction of optically-controlled squared frequency-selective surface (FSS) structures printed on highly resistive (HR) silicon substrate are presented, from a innovative bistatic microwave photonic characterization technique operating in the 40 to 60 GHz frequency range, commonly used for radar cross section (RCS) measurements. According to typical physical photon absorption phenomenon occurring in photoconductive materials, these structures demonstrate experimentally a bandpass filtering frequency response cancellation through reflection coefficient measurements, under specific incident collective illumination in the Near-infrared region (NIR). This behaviour is attributed to their microwave surface impedance modification accordingly to the incident optical power, allowing ultrafast reconfigurability of such devices by optics

Multi-Photon Ionization of Excited Atoms in Gaseous Discharge by Ruby Laser Light

1982 ◽  
Vol 51 (11) ◽  
pp. 3660-3665
Author(s):  
Toshihiko Ohno ◽  
Koichi Suzumura ◽  
Takayoshi Okuda
Keyword(s):  
Ruby Laser ◽  
Laser Light ◽  
Gaseous Discharge ◽  
Excited Atoms ◽  
Photon Ionization

Detection of Atmospheric Pollutant NO With the Method of Resonant-Enhanced Multiphoton Ionization

2012 ◽  
Vol 209-211 ◽  
pp. 1596-1599
Author(s):  
Gui Yin Zhang ◽  
Yi Dong Jin ◽  
Hai Ming Zheng
Keyword(s):  
Decay Curve ◽  
Resonant State ◽  
Multiphoton Ionization ◽  
Photon Absorption ◽  
Ionization Cross ◽  
Atmospheric Pollutant ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Photon Ionization ◽  
Key Substances

NO is one of the key substances of air pollution. This paper presents the use of the technique of resonant enhanced multi-photon ionization (REMPI) for NO ambient detection. NO is ionized by absorbing four photons and via A2Σ intermediate resonant state when use 452.4nm laser as radiation source. A physical model concerning the ionization process is presented. It is shown that the ion signal depends on laser character and the dynamic parameters of NO. Two-photon absorption and ionization cross section about the resonant state are obtained from the ion decay curve and the model. The detection limit of this work, which can reach 1.4 ppm, is determined by measuring the variation of the ion signal with the concentration of NO.

Resonant enhancement effect on two-photon absorption due to excitons in alkaline-earth fluorides excited with synchrotron radiation and laser light

1999 ◽  
Vol 60 (12) ◽  
pp. R8442-R8445 ◽  
Author(s):  
Toru Tsujibayashi ◽  
Masayuki Watanabe ◽  
Osamu Arimoto ◽  
Minoru Itoh ◽  
Shunsuke Nakanishi ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Alkaline Earth ◽  
Laser Light ◽  
Photon Absorption ◽  
Enhancement Effect ◽  
Resonant Enhancement ◽  
Two Photon Absorption ◽  
Two Photon

Polarization dependence of resonant multiphoton ionizations on 1S0 and 1,3D2 states in atomic mercury

1988 ◽  
Vol 66 (1) ◽  
pp. 1-6
Author(s):  
K. R. Mah ◽  
F. W. Dalby ◽  
C. W. Barnard
Keyword(s):  
Stark Effect ◽  
Light Polarization ◽  
Polarization Dependence ◽  
Focal Volume ◽  
Resonant Level ◽  
Photon Excitation ◽  
Photon Ionization ◽  
Polarization Dependences ◽  
The One ◽  
Atomic Mercury

The polarization dependences of some resonant multiphoton ionizations in atomic mercury have been measured with a broadband (bandwidth ≈ 1.5 cm−1) multimode dye laser at moderate light intensities (≈ 500 MW∙cm−2). The multiphoton processes studied were the absorption of four photons to a resonant 1S0, 1D2, or 3D2 level by one-photon ionization. Complete saturation of the one-photon ionization step results in the ionization of all atoms excited to the resonant level. Because of the saturation of the ionization step, the polarization dependence of the four-photon excitation to the resonant level is measured. The theory developed by Dalby et al. is shown to give good agreement with the experiment when it is used to calculate the polarization dependence of the multiphoton transition to the resonant level. For the 6d1D2 resonance, distortions in the polarization dependence and an unusual linewidth dependence on the light polarization were observed. We relate these observations to the alternating current Stark effect and to the production of the third harmonic of the laser light in the focal volume.

Dissociative two-photon ionization of N2 in extreme ultraviolet by intense self-amplified spontaneous emission free electron laser light

2008 ◽  
Vol 92 (15) ◽  
pp. 154103 ◽  
Author(s):  
Takahiro Sato ◽  
Tomoya Okino ◽  
Kaoru Yamanouchi ◽  
Akira Yagishita ◽  
Fumihiko Kannari ◽  
...  
Keyword(s):  
Spontaneous Emission ◽  
Free Electron ◽  
Free Electron Laser ◽  
Laser Light ◽  
Extreme Ultraviolet ◽  
Amplified Spontaneous Emission ◽  
Two Photon ◽  
Photon Ionization

Tunable Uv Laser Photolysis of Organometallic Compounds with Product Detection by Laser Mass Spectroscopy

1988 ◽  
Vol 129 ◽  
Author(s):  
Th. Beuermann ◽  
M. Stuke
Keyword(s):  
Mass Spectroscopy ◽  
Laser Light ◽  
Uv Light ◽  
Frequency Doubling ◽  
Organometallic Compounds ◽  
Dye Laser ◽  
Laser Photolysis ◽  
Photon Absorption ◽  
Uv Laser ◽  
Group Iii

ABSTRACTWe use tunable UV laser light in the region 200-320 nm, produced by frequency doubling the output of a dye laser for the decomposition of organometallic compounds. This method has been applied to TMA, trimethylaluminum AI(CH3)3. Only theTMA monomer absorbs UV light for λ>220nm. TMA decomposes by one-photon absorption mainly into two channels: aluminum plus organic fragments and aluminummonomethyl plus organic fragments. The ratio [A1]/[AICH3] is wavelength dependent. Finally, we present a mechanism to explain the photolysis of trimethyl compounds of group III elements (Al,Ga,In).

Nonlinear Laser Melting Of Indium Antimonide And Silicon

1983 ◽  
Vol 13 ◽  
Author(s):  
Michael P. Hasselbeck ◽  
H. S. Kwok
Keyword(s):  
Indium Antimonide ◽  
Laser Light ◽  
Free Carrier ◽  
Photon Absorption ◽  
Free Carrier Absorption ◽  
Two Photon Absorption ◽  
Free Carriers ◽  
Two Photon ◽  
Avalanche Ionization ◽  
Carrier Absorption

ABSTRACTPulsed 10.6μm TEA CO2 laser light has been used to melt the semiconductors silicon and InSb. Measurements indicate that generation of free carriers necessary for melting may take place by nonlinear processes such as two-photon absorption or intraband avalanche ionization. If the semiconductor is sufficiently doped, melting may also result from linear free carrier absorption. In all cases, it appears that the molten depth exceeds several μm, which is much greater than obtained with lasers of shorter wavelength.

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