isotope-abundances

A simple library to provide isotope abundances with JavaScript

View on npm here.

Please note that this package is now on version 2.0 and is no longer compatible with version 1.0. The return format of the data is now different.

Installation

npm install isotope-abundances --save

Usage

var isoAbund = require('isotope-abundances');
console.log(isoAbund('H'));

Output:

{
    "Mass": 1.00794,
    "Isotopes": [
      {
        "Mass": 1.00782503223,
        "Abundance": 0.999885
      },
      {
        "Mass": 2.01410177812,
        "Abundance": 0.000115
      }
    ]
  }

The output for each isotope is a JSON object where "Mass" contains the average mass of the atom and the "Isotopes" array contains the mass and abundance of each isotope.

Tests

You can run npm test to run the tests after installing the development dependencies.

Data

The isotope data for this package comes from NIST and was retrieved on June 1st, 2017. The "Linearized ASCII Output" for all elements and all isotopes can be found in NIST_DATA.dat. The script generate_json.js can be used to regenerate the ISOTOPES.json file which contains the isotopic distribution data. The development dependencies must be installed before running generate_json.js.

License

This software is released under the MIT license

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