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CAESIUM ION CODE

Assuming the same distribution of electrons as positive ions, we can calculate the ratio of the plate current to the grid current in this type of tube. This ratio, 0.72, is the same as the ratio between the total area of the plate less the projected area of the grid, and the total plate area. This number increased uniformly from 0.01 at approximately 100 volts to 0.15 at 600 volts.Ĭalibration of tube.-After corrections for the emission of secondary electrons were made, the ratio of the positive ion current to the plate to the total emission current was found to be independent of the plate and grid potentials for plate potentials greater than 0.2 of the grid potential. From these observations the number of electrons that were emitted from the caesium covered grid and plate per positive ion was calculated. The plate current and total positive ion emission current were observed for each of several negative grid potentials as the plate potential was varied from +50 to -650 volts. Number of electrons emitted from a Cs covered grid and plate per positive Cs ion striking them.-The source of the positive caesium ions, a short tungsten filament maintained at about 1200°K in the presence of caesium vapor, was mounted on the axis of a long cylindrical grid and plate.

CAESIUM ION CODE

const crypto = require('crypto') const codeVerifier = 'abc123' // This code should be randomly generated const hash = crypto.createHash('sha256').update(codeVerifier).digest() const codeChallenge = hash.toString('base64'). Here is a code sample that can be used in your application to generate the code_challenge for the PKCE extension. If application/json is an acceptable response you receive: Computing the code challenge The format of the response depends on the Accept header used during the request. cesium (Cs), also spelled caesium, chemical element of Group 1 (also called Group Ia) of the periodic table, the alkali metal group, and the first element to be discovered spectroscopically (1860), by German scientists Robert Bunsen and Gustav Kirchhoff, who named it for the unique blue lines of its spectrum (Latin caesius, sky-blue).

code_verifier The string whose hash value was passed to the authorization step in the code_challenge parameter.

The following parameter is required if you used the PKCE extension in the authorization step. This must match the URI provided when you registered your application.

redirect_uri ( Required) The URI that a user was redirected to during the authorization step.

code ( Required) This is a code that you were provided during the authorization step.

grant_type ( Required) Must always have the value authorization_code.

Once you have the code you can exchange it for an access_token, which you can then use that to access the user’s account. If it is different do not proceed to the token exchange step.

state This is the exact string you passed during the request.

code This is a code that you will use during the token exchange step.

This much match the Redirect URI of the registered application.

redirect_uri The URI you passed during the request.

Once they user has granted permission, Cesium ion will redirect the user to the redirect_uri you specified in the request.

code_challenge A Base64 URL encoded SHA256 hash of the code_verifier that you will pass with the token exchange request.

If you use the extension, then both are required. This is recommended to increase security. The following 2 parameters are used if you implement the PKCE extension. This is not required but strongly recommended. Used to protect against cross-site request forgery attacks.

state A unique string that will be sent back to the redirect_uri.

assets:write : Create, modify, and delete assets in the account. assets:read : Read metadata and access the tiled data for individual assets in the account. Possible scopes are: - assets:list : List the metadata for all assets available to the account.

scope ( Required) A space separted list of requested scopes.

redirect_uri ( Required) The URI that a user will be redirected to once they authorize your application.client_id ( Required) The client ID that was assigned to your application when you registered it.response_type ( Required) Must always have the value code since we only use one flow type.For native applications, this request should be made through a browser and not an embedded web view. It will prompt the user to log in to Cesium ion and ask for their permission to give you access. This request should be made by redirecting the user to this page. Once permission is granted we will redirect the user back to you with the code. You will make a request for a code that will prompt the user for permissions.