The following keywords may be used as restrictables in TAP-VAMDC queries using VSS1 language, also they are added to registry for each new node.
Note that each node supports only a small subset of the keywords. The list of supported keywords may be retrieved through VOSI Capabilities service endpoint. See the TAP-VAMDC documentation for further details.
Return data excluding any additions or improvements that were made after the given date (YYYY-MM-DD). This allows for reproducing an earlier query. Note that probably not all nodes support this.
Type: string
Constraints:
The atomic mass is the mass of an atom expressed in unified atomic mass unit u. It is defined as 1/12 of the rest mass of an unbound carbon-12 atom in its nuclear and electronic ground state. 1 u = 1.660538782(83)E-27 kg.
Units: u
Type: floating-point number
Constraints: >1
Atomic mass number (A), also called mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. Because protons and neutrons both are baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion. The mass number is different for each different isotope of a chemical element.
Type: integer number
Constraints: >0
The total angular momentum of a nucleus, usually represented as l. For electrons spin and orbital angular momentum are treated separately but particles in a nucleus generally behave as a single entity with intrinsic angular momentum I. Associated with each nuclear spin is a nuclear magnetic moment which produces magnetic interactions with its environment.
Type: floating-point number
Constraints:
Coupling scheme used to describe the state. Currently five coupling schemes are supported LS, jj, J1J2, jK and LK. For a detailed description of these and other schemes see, e.g., Atomic Spectroscopy at http://physics.nist.gov/Pubs/AtSpec/index.html
Type: string
Constraints:
Ionization energy in eV
Units: 1/cm
Type: floating-point number
Constraints: >0
Magnetic quantum number of a state, can be integer or half-integer, positive and negative.
Type: floating-point number
Constraints:
State parity. Can have values: “even”, “odd” or “undefined”
Type: string
Constraints:
The quantum defect is a correction applied to the potential to account for the fact that the inner electrons do not entirely screen the corresponding charge of the nucleus. It is particularity important for atoms with single electron in the outer shell.
Type: floating-point number
Constraints:
The concentration of a species contributing to an Environment
Type: floating-point number
Constraints:
The mole fraction of a species contributing to an Environment
Type: floating-point number
Constraints:
The partial pressure of a species contributing to an Environment
Type: floating-point number
Constraints:
Environment temperature
Units: K
Type: floating-point number
Constraints: >0
The total number density of particles comprising an Environment
Units: 1/cm3
Type: floating-point number
Constraints:
Environment total pressure
Units: Pa
Type: floating-point number
Constraints: >=0
The IUPAC International Chemical Identifier (InChI) is a textual identifier for chemical substances, designed to provide a standard and human-readable way to encode atomic and molecular information and facilitate the search and exchange of such such information in databases and on the web.
Type: string
Constraints:
InChi key is hashed, fixed-length (currently 27 character) form of International Chemical Identifier (InChI) string describing a given atom/ion/isotope. InChIKeys consist of 14 characters resulting from a hash of the connectivity information of the InChI, followed by a hyphen, followed by 9 characters resulting from a hash of the remaining layers of the InChI, followed by a single character indication the version of InChI used, another hyphen, followed by single checksum character. More information about InChI and InChI Key can be found at http://www.iupac.org/inchi/
Type: string
Constraints:
Method category. Allowed values are: experiment, theory, ritz, recommended, evaluated, empirical, scalingLaw, semiempirical, compilation, derived
Type: string
Constraints:
Conventional molecule name, e.g. CO2, NH3, Feh (may not be unique)
Type: string
Constraints:
The harmonic frequency of a normal mode.
Units: MHz
Type: floating-point number
Constraints:
The molecular J quantum number for total angular momentum excluding nuclear spin
Type: floating-point number
Constraints:
K is the quantum number associated with the projection of the total angular momentum excluding nuclear spin, J, onto the molecular symmetry axis.
Type: integer number
Constraints:
Ka is the rotational quantum label of an asymmetric top molecule, correlating to K in the prolate symmetric top limit.
Type: integer number
Constraints:
Kc is the rotational quantum label of an asymmetric top molecule, correlating to K in the oblate symmetric top limit.
Type: integer number
Constraints:
For diatomic molecules, the vibrational quantum number, v
Type: integer number
Constraints:
Nuclear spin isomer (symmetry) of a molecular state. Can take values like ‘ortho’,’para’,’A’,’E’,’meta’, etc.
Type: string
Constraints:
Particle name, one of photon, electron, muon, positron, neutron, alpha, cosmic
Type: string
Constraints:
Only Restrictable (not NULL) to make a query where there is Broadening information.
Type: string
Constraints:
Only Restrictable (not NULL) to make a query where there is Broadening information.
Type: string
Constraints:
Only Restrictable (not NULL) to make a query where there is Broadening information.
Type: string
Constraints:
Only Restrictable (not NULL) to make a query where there is Broadening information.
Type: string
Constraints:
Effective Lande factor for a given transition
Type: floating-point number
Constraints:
Radiative transition frequency.
Units: MHz
Type: floating-point number
Constraints:
The Einstein coefficient for spontaneous radiative de-excitation (emission) A.
Units: 1/s
Type: floating-point number
Constraints: >= 0
Line profile-integrated absorption for transition between two energy levels. Line strength K = hν / 4π (n<sub>1</sub> B<sub>12</sub> - n<sub>2</sub> B<sub>21</sub>)
Units: 1/cm
Type: floating-point number
Constraints: >0
Radiative transition vacuum wavelength
Units: A
Type: floating-point number
Constraints:
Type of publication, e.g. journal, book etc.
Type: string
Constraints: Journal | Book | Proceedings | On-line
Node-specific species identifier, last measure to uniquely identify species if any other identifiers collide
Type: string
Constraints:
Life time of an atomic state in s.
Units: s
Type: floating-point number
Constraints: >0
Internal VAMDC species identifier, inchikey plus suffix, used in case inchikeys collide for molecules.
Type: string
Constraints: