Spectral%20Line%20Access

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Spectral Line Access

• Paris Observatory and ESA/ESAC
• ML Dubernet, P. Osuna, M. Guanazzi,
• J. Salgado, E. Roueff
• MLD acknowledges support from VO-France, MDA
  project (F. Genova), Paris Observatory

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Project Overview (1)

• Access Atomic/Molecular DB starting with line
  lists
• Theoretical (measured or calculated) DB
• Observed line lists DB
• Necessary to access complementary information in
  order to interpret spectra or model astrophysical
  media excitation rate coefficients, etc..
• Clients stronger evolution towards public
  software packages for spectral analysis and on
  line codes for astro. Simulation
• Shared, structured, complete and documented
  access to AM DB
• Standardisation O/I, queries, ressources ID

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Overview (2)

• Numerous DB are available
• Atomic lines NIST DBs, Kurucz's CD-ROM, Atomic
  Line List of P. Van Hoof, TOPbase, Kelly Atomic
  Line DB, VALD, MCHF/MCDHF Collection, D.R.E.A.M,
  KAERI AMODS
• Molecular Lines JPL Spectroscopic DB, CDMS,
  HITRAN, GEISA, NIST
• Other DB IEAE, NIFS, CHIANTI, UMIST, BASECOL,
  small compilations
• Observed databases ATOMDB, NIST, ...
• Identification of Pbs
• Different DB have similar datasets
• DB have different levels of update
• Lengthy to identify origin of datasets, find all
  relevant description of data
• Useful data for a single astrophysical
  application are dispersed in various DB
• No homogeneous description of data

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Access to Lines Data Model

• Based on fundamental physics, current databases
  and needs in astrophysics
• Current DM is centered around line for atom and
  molecules electronic, vibrational, rotational
  transitions (couplings)
• Allows for identification of
• Chemical Species
• Level --gtQuantum State--gtQuantum numbers
• Origin and modification of Line
• Can be used to model other processes involving
  transitions because a line corresponds to a
  transition between two levels
• Could be extended to nuclear physics

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H(3p 2P0 3/2)---gt H(1s 2S 1/2) hv
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Quantum Number coupling

• N2H rotationN, 3 nuclearSpinI
• level characterized with a single state NF1F2Fgt
• NI1 F1 F1I2F2 F2I3 F
• QuantumNumber I1
• name nuclearSpinI
• type nuclear spin of outer nitrogen
• origin pure
• intValue 1
• QuantumNumber F2
• name intermediateAngularMomentumF
• type intermediate angular momentum
• origin N nuclearspinI (nuclear spin of outer
  nitrogen)
• nuclearspinI (nuclear spin of inner
  nitrogen)
• value 0

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DM general transition model

• Each time a species undergoes a transition, it
  can be modeled by a Line DM
• A transition is modeled by
• Before .... Oups Something happens! ... After
• Light Matter Interaction bound-bound
• A(j) hv ---gt A(j')
• A(j') ---gt A(j) hv

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DM general transition modelLight-Matter
bound-continuum

• Radiative recombinaison
• (Z, N-1)level.of.Z(N-1) e ---gt (Z,
  N)level.of.Z(N) hv
• InitialElement ChemicalElement
• IonizationStage -1
  (comparatively to N)
• Z is specified
• full atomic symbol is
  specified (see DM)
• FinalElement ChemicalElement
• IonizationStage 0
  (comparatively to N)
• Z is specified
• full atomic symbol is
  specified (see DM)

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DM general transition modelMatter Matter
Interaction

• Reaction AB(i) C(k) --gt A(j) BC(l)
• Reactant (1 to ) Line AB, C
• InitialChemical AB or C
• InitialLevel_species i
• FinalLevel_species none
• FinalChemical none
• Products (1 to ) Line A, BC
• Reverse identification

• Excitation A(i) B(k) --gt A(j) B(l)
• TargetLine Line A
• initialElementfinalElement
• InitialLevel i finalLevel j
• PerturberLine Line B
• Other attributes specific to excitation
• Temperature
• Rate coefficients

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DM document Current status

• Draft currently being written up
• All attributes are carefully described following
  exact theoretical definitions
• Most quantum numbers are described
• In particular, most of the well known coupling
  cases

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DM missing Provenance

• Observations see characterization
• Measured Data instrument and parameters
• Calculated sets VOTheory
• Various steps in getting final data, ex
• Method
• Hamiltonian (parameters, approximations), basis
  sets
• Algorithms
• Fitting functions parameters, function, error
• Etc...

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Access Query Parameters

• Opened question for Line Access
• SLAP Simple Line Access Protocol
• By wavelength_min, _max, _mid
• By species Fe I, H20, ...
• By type of transition (E1, M1, E2)
• By type of levels (vibration, rotation, ..)
• Combined with associated processes
• Would we allow search of other processes
  independently of lines ?

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Access to Lines SLAP

• What information do we retrieve from a service
  implementing SLAP?
• Wavelength mandatory
• Initial/Final ChemicalElement should
• Name or atomicSymbol/formula should
• Initial/Final Level should
• QuantumState should
• energy, statWeight should
• Einstein A should
• Optional everything else

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Access to Lines questions

• Registry parameters?
• Wavelength range
• Keywords energies, atoms or molecules,
  processes
• Practically how should we proceed ?
• Some DB will implement VO, otherwise create VO
  providers
• Create Web Services and vizualization tools with
  filters

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Milestones 2005-2006

• 1rst Draft  Atomic and Molecular Lines Data
  Model  July 2005
• Agree on SLAP July 2005
• Get inputs from community until Sept. 05
• Implement simple prototype Next Interop.
• Extend DM Provenance, .. Queries 2006

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Contacted peoplePhysicists, Databases,
Astronomers

• GEISA N. Husson-Jacquinet
• HITRAN L. Rothman
• CDMS S. Schlemmer
• JPL J. Pearson
• UMIST T. Millar
• CHIANTI P. Young
• DREAM P. Quinet
• TOPBase C. Zeippen
• NIST F. Lovas, Y. Ralchenko
• NIFS T. Kato
• IEAE B. Clark

• KAERI Y.-J. Rhee
• ATOMDB N. Brickhouse
• D. Schwenke
• J. Tennyson
• A bunch of french spectroscopists
• J. Aboudarham (solar)
• B. Plez (stars)
• J. Cernicharo (ISM)
• F. Valdes (calibration package)