Multi-step and Multi-photon Excitation Studies of Group-IIB Elements

Slides:

Advertisements

Similar presentations

Photoexcitation and Ionization of Cold Helium Atoms R. Jung 1,2 S. Gerlach 1,2 G. von Oppen 1 U. Eichmann 1,2 1 Technical University of Berlin 2 Max-Born-Institute.

Advertisements

COST 529, April 12-16, Madeira, Portugal IAPS, University of Latvia Modelling of spectral line shapes in electrodeless discharge lamps G. Revalde 1, N.

Cphys351 c4:1 Chapter 4: Atomic Structure The Nuclear Atom The Atom as the smallest division of an element quantization of electric charge oil drop experiments.

INFRARED SPECTROSCOPY OF SIZE-SELECTED NEUTRAL AND CATIONIC AMMONIA CLUSTERS COMBINED WITH VACUUM-ULTRAVIOLET- PHOTOIONIZATION MASS SPECTROMETRY Masaki.

Frequency and Time Domain Studies of Toluene Adrian M. Gardner, Alistair M. Green, Julia A. Davies, Katharine L. Reid and Timothy G. Wright.

LCLS Atomic Physics with Intense X-rays at LCLS Philip H. Bucksbaum, University of Michigan, Ann Arbor, MI Roger Falcone, University of California, Berkeley,

Condensed phase vs. Isolated gas phase spectra Solution phase A A A A A A W W W W W WW W W W W W W W W W W W: water A: sample ( nm) ( nm) Isolated.

Probing the Rydberg spectrum of strontium – group meeting Probing the Rydberg spectrum of strontium James Millen.

Graham Lochead 07/09/09 Pulsed laser spectroscopy in strontium.

Introduction to TDAONBGMFUVP Edward Gash 11 Dec 2003.

Rydberg physics with cold strontium James Millen Durham University – Atomic & Molecular Physics group.

2 AB AB + + e AB* AB +* + e n h or n 1 h 1 + n 2 h 2 + : -absorption 1h  n h  -ionization Energy.

Studying our cold Rydberg gas James Millen. Level scheme (5s 2 ) 1 S 0 461nm 32MHz (5s5p) 1 P 1 (5sns) 1 S 0 (5snd) 1 D 2 Continuum ~413nm Studying our.

1 National Cheng Kung University, Tainan, Taiwan First Experimental Observation of the Doubly-Excited 2 1  g State of Na 2 Chin-Chun Tsai, Hui-Wen Wu,

Excited state spatial distributions Graham Lochead 20/06/11.

Advanced Higher Chemistry Unit 1 Spectroscopy. Spectroscopy  Spectroscopy is used to give information regarding the structure of atoms or molecules.

A strontium detective story James Millen Strontium detective – Group meeting 19/10/09 Ions‽

Photoelectron Spectroscopy Lecture 7 – instrumental details –Photon sources –Experimental resolution and sensitivity –Electron kinetic energy and resolution.

4-1 Chap. 7 (Optical Instruments), Chap. 8 (Optical Atomic Spectroscopy) General design of optical instruments Sources of radiation Selection of wavelength.

Atomic Emission Spectrometry

RYDBERG ELECTRONS International Symposium on Molecular Spectroscopy 17 June 2008 Michael P. Minitti Brown University STEALTHY SPIES OF MOLECULAR STRUCTURE.

Spectral Line Physics Atomic Structure and Energy Levels Atomic Transition Rates Molecular Structure and Transitions 1.

Chapter 5 Alkali atoms Properties of elements in periodic table The Alkali metals.

Heavy Elements Transition Probability Data of Interest in Astrophysics and Divertor Physics Betsy Den Hartog University of Wisconsin - Madison Madison,

A new theoretical insight into the spectroscopic properties of polonium and astatine atoms Pascal Quinet Spectroscopie Atomique et Physique des Atomes.

APOGEE: The Apache Point Observatory Galactic Evolution Experiment l M. P. Ruffoni 1, J. C. Pickering 1, E. Den Hartog 2, G. Nave 3, J. Lawler 2, C. Allende-Prieto.

INTRODUCTION Nucleosynthesis is the method where by nuclides heavier than that of Hydrogen are generated in celestial bodies. Neodymium (Nd) is a Rare-Earth.

Laboratory for Optical Physics and Engineering MOLECULAR SPECTROSCOPY OF RARE EARTH AND METAL-HALIDE MOLECULES International Symposium on Molecular Spectroscopy.

Photoassociation Spectroscopy of Ultracold Molecules Liantuan XIAO State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser.

1 Components of Optical Instruments Lecture Silicon Diode Transducers A semiconductor material like silicon can be doped by an element of group.

Observation of Excited Biexciton States in CuCl Quantum Dots : Control of the Quantum Dot Energy by a Photon Itoh Lab. Hiroaki SAWADA Michio IKEZAWA and.

Kinetic Investigation of Collision Induced Excitation Transfer in Kr*(4p 5 5p 1 ) + Kr and Kr*(4p 5 5p 1 ) + He Mixtures Md. Humayun Kabir and Michael.

Solution Due to the Doppler effect arising from the random motions of the gas atoms, the laser radiation from gas-lasers is broadened around a central.

1 INSTITUTE of SOLID STATE PHYSICS Founded Laboratories and Theoretical Department Staff - 180, Scientific staff In the field of atomic and.

Plasma diagnostics using spectroscopic techniques

Experimental and Theoretical Investigations of HBr+He Rotational Energy Transfer M. H. Kabir, I. O. Antonov, J. M. Merritt, and M. C. Heaven Department.

Progress towards laser cooling strontium atoms on the intercombination transition Danielle Boddy Durham University – Atomic & Molecular Physics group.

Tunable, resonant heterodyne interferometer for neutral hydrogen measurements in tokamak plasmas * J.J. Moschella, R.C. Hazelton, M.D. Keitz, and C.C.

Progress of the Laser Spectroscopy Program at Bridgewater State College Greg Surman, Brian Keith, and Edward Deveney Department of Physics, Bridgewater.

Electronic Transitions of Palladium Monoboride and Platinum Monoboride Y.W. Ng, H.F. Pang, Y. S. Wong, Yue Qian, and A. S-C. Cheung Department of Chemistry.

Substitute Lecturer: Jason Readle Thurs, Sept 17th, 2009

Wbt1 Chapter 10. REMPI, ZEKE, and MATI Spectroscopies Resonance-enhanced multiphoton ionization (REMPI) spectroscopy involves more than one photons in.

Femtosecond Laser Spectroscopy of C 60 Nieuwegein, The Netherlands August 21, 2001 Eleanor Campbell, Göteborg University & Chalmers, Sweden R.D. Levine,

Region of possible oscillations

Electronic transitions of Yttrium Monoxide Allan S.-C. Cheung, Y. W. Ng, Na Wang and A. Clark Department of Chemistry University of Hong Kong OSU International.

Resonant dipole-dipole energy transfer from 300 K to 300μK, from gas phase collisions to the frozen Rydberg gas K. A. Safinya D. S. Thomson R. C. Stoneman.

Molecular Triplet States: Excitation, Detection, and Dynamics Wilton L. Virgo Kyle L. Bittinger Robert W. Field Collisional Excitation Transfer in the.

Eirík´s project(?) CH3I: agust,www,...rempi/ch3i/PPT ak.ppt ( )

High-Resolution Visible Spectroscopy of H 3 + Christopher P. Morong, Christopher F. Neese and Takeshi Oka Department of Chemistry, Department of Astronomy.

Chan Ho Kwon, Hong Lae Kim, and Myung Soo Kim* National Creative Research Initiative Center for Control of Reaction Dynamics and School of Chemistry, Seoul.

Spatial distributions in a cold strontium Rydberg gas Graham Lochead.

of Xenon Collision Dimers in the VUV Energy Region

Rydberg States of Two Valence Electron Atoms W. E Cooke K.A. Safinya W. Sandner F. Gounand P. Pillet N. H. Tran R. Kachru R. R. Jones.

Laboratory photo-ionized plasma David Yanuka. Introduction  Photo-ionized plasmas are common in astrophysical environments  Typically near strong sources.

High-resolution Spectroscopy of Long- range Molecular Rydberg States of 85 Rb 2 Ryan Carollo, Edward E. Eyler, Yoann Bruneau Phillip L. Gould, and W. C.

Spatial distributions in a cold strontium Rydberg gas Graham Lochead.

© OPTOGALVANIC SPECTRA OF CALCIUM IN THE ANGSTROM REGION KHAN, MA; GONDAL, MA; RAIS, MH SPRINGER.

The Spectra of Solid Xenon Luminescence Excited by the Bulk Electrical Discharge E.B. Gordon, Institute of Problems of Chemical Physics RAS, Chernogolovka.

Line Spectra When the particles in the solid, liquid, or gas accelerate, they will produce EM waves. Electron orbit to orbit transitions in atoms (gasses)

Rydberg Series of C 60 Osnabrück, Germany March 2002 Eleanor Campbell, Göteborg University & Chalmers, Sweden R.D. Levine, Fritz Haber Center, Hebrew University.

Many-Body Effects in a Frozen Rydberg Gas Feng zhigang

Resonance-enhanced Photoassociative Formation of Ground-state Rb 2 and Spectroscopy of Mixed-Character Excited States H.K. Pechkis, D. Wang, Y. Huang,

Quantum phenomena AS Physics pp

Helium-neon Laser.

Historical facts The Helium-Neon laser was the first continuous laser.

Metastable States Arising from the Ablation of Solid Copper

State evolution in cold helium Rydberg gas

Resolution of Transient States of Nitrile Anions via Photodissociation Action Spectroscopy; Our Progress to Date The 2 traces show resonant Cu atomic.

Frauke Schroeder and Edward R. Grant Department of Chemistry

Helium-Neon Laser TIT GROUP Of INSTITUTIONS, BHOPAL [M.P.] By

Presentation transcript:

Multi-step and Multi-photon Excitation Studies of Group-IIB Elements ALI NADEEM Laser Spectroscopy Laboratory National Institute of Lasers and Optronics (NILOP) Islamabad, Pakistan

Introduction The bound states of Group II-B (Cd, Zn and Hg) are rarely studied, having similar ns2 configuration as Alkaline earth elements. The resonance levels 1P1 lies in UV (Zn, Cd) and VUV (Hg), and ionization potentials are also very high ( 8-10 eV ) We have selected the 3P1 inter-combination level to approach the Rydberg states. The 3P1 level lie at lower energy as compare to 1P1 The fine structure energy difference is not very large therefore, the 3P0, 2 and 3D3 metastable state get populated due to collision energy transfer. Consequently, one can observe the Rydberg states possessing larger J-values.

Rydberg States The states of high principal quantum number n. Rydberg atom = Highly excited atom Ionization threshold Energy Rydberg Formula (in a.u)

Multi-step and multi Photon laser excitation The step-wise excitation is an excellent technique for the investigation of Rydberg States. Rydberg states can be investigated which can not be probe by one photon transition. Transitions that lie in the UV and VUV region can be approached using dye laser in visible and near UV region. The spectral resolution depends on the line-width of the dye laser. The step-wise excitation provides the maximum probability of exciting the atoms to the high lying states.

Schematic Diagram of the Experimental set-up

Thermionic Diode Ion Detector Highly suitable device for measuring the line intensities, line shapes and high lying Rydberg states. The collisional ionization of high-lying Rydberg levels is utilized in the thermionic diode. 3-5 A Water cooling jackets Buffer gas inlet To vacuum pump Cathode wire Sample Laser passage

Laser Spectroscopy laboratory at NILOP

Highly Excited States of Zinc

Multi-Step Laser Excitation from the 4s5s 3S1 excited state

Laser Excitation Spectra of Zinc

Excited states of Zinc from the 4s5s 3S1 excited state

Highly excited states close to the ionization threshold

Two-step excitation scheme for the investigation Rydberg states of Zinc 1 S P o 10 20 30 40 50 60 70 80 Energy cm-1 X10 3 D 2 F 0, 1,2 1, 2,3 2, 3,4 l = 307.6 nm = 231-240 nm 3P0,1,2 Selection rules: 4s 1S0

Spin-Orbit Interaction Atomic No. of Zinc Z = 30 Atomic No. of Cadmium Z = 48 Atomic No. of Mercury Z = 80

Excitation Spectrum from the 4s4p 3P1,2,3 intermediate states of zinc

Excitation spectra of zinc, the series convergence from the 4s4p 3P0,1,2 excited states

Highly excited states of Zn close to the ionization limit excited from the 4s4p 3P1 state

Three-step laser excitation spectra of zinc from the 4s4d 3D1,2,3 states 62776.993 cm-1 4s4d 3D1,2,3 62772.029 cm-1 62768.756 cm-1

Highly Excited states of zinc at different pressure at 3 and 10 mbar

Ionization Potentials of Zinc 4snp 3P2 (12 ≤ n ≤ 60) , 75769.31± 0.05 cm-1 4snd 3D2 (14 ≤ n ≤ 55), 75769.35± 0.05 cm-1

Highly Excited States of Cadmium

Two-step excitation spectra of Cadmium 72225 72250 72275 72300 72325 72350 72375 200 300 400 500 600 700 800 900 23d 1 D 2 27d 3 481nm 27s S Ionization Signal(arb.units) Term Energy cm -1 23s 480nm 21d

Highly Excited States of Cadmium

Absorption Spectroscopy Multi-step laser excitation of the odd-parity 5snℓ (ℓ = 3) states of neutral cadmium Absorption Spectroscopy 59515. 980 cm-1 5s5d 3D1,2,3 59497.868 cm-1 59485.768 cm-1 59515. 980 cm-1 5s5d 3D1,2,3 59497.868 cm-1 59485.768 cm-1 The spectrum of cadmium showing the 5snf 3F3 (14  n  21), 5snf 3F4 (14  n  21), 5snf 3F2 (14  n  20) and 5snd 3P1 (16  n  27) Rydberg series excited from the 5s5d 3D1,2,3 multiplet.

Highly Excited States of Cadmium

Ionization Potentials of Cadmium 5snd 3D2 (11 ≤ n ≤ 52) Ionization Energy 72540.06 ± 0.13 cm-1 5sn f 3F3 (12 ≤ n ≤ 52) Ionization Energy 72540.05 ± 0.13 cm-1

Two-step laser excitation spectrum of Hg 84184.15 (5) cm-1 250-223 nm 6s6p 3P1 39412.237 cm-1 λ = 253.73 nm 6s2 1S0

International Publication Two-step laser spectroscopy of the highly excited states of cadmium Ali Nadeem, M Nawaz, S A Bhatti and M A Baig J. Phys. B: At. & Mol. Opt. Phys. 38 (2005) 867-875 2. Two-step laser excitation of the 4snd 3D1,2,3 and 4sns 3S1 states from the 4s4p3P1 level in zinc J. Phys. B: At. & Mol. Opt. Phys. 39 (2006) 871-881 3. Multi-step laser excitation of the highly excited states of zinc Optics Communications 259 (2006) 834-839 4. Two-step laser excitation of the highly excited even-parity states of atomic murcury Ali Nadeem, M Nawaz, S. U. Haq, S. Shahzada, S A Bhatti and M A Baig Eur. Phys. J. D. (2009) 53, 147-151 5. Oscillator strength measurements from the 4s4p 3P1 4snd 3D2 excited state of zinc. S. U. Haq, Ali Nadeem, M. Nawaz and M.A Baig J. Opt. Soc. Am. B (2010) 27, 402-407 6. Oscillator strength measurements of the 5s5p 3P1 5snd 3D2 Rydberg transitions of cadmium. Ali Nadeem and S. U. Haq Spectrochimica Acta Part B 65, (2010) 842-846

Continu…… 7. Three - step laser excitation of the odd-parity 5s5d 3D →5snf 3F states of cadmium Ali Nadeem, M Shah, S U Haq, S Shahzada, M Mumtaz, A Waheed, M Nawaz, M Ahmed and M A Baig Eur. J. Phys. D. 68, (2014) 192 8. Three-step laser excitation of the odd-parity 4s4d 3D →4snf 3F states of zinc Ali Nadeem, M. Shah, S. U. Haq and M A Baig Submitted: (Spectrochimica Acta Part B 2016)

Thank you NILOP