Opening ESR Files

The ESR file type is primarily associated with Bruker's Xenon.

ESR	File extension: ESR
	File type:	data file

What is an ESR file

ESR files mostly belong to Bruker's Xenon. ESR files are Electron Spin Resonance data files used to record measurements from experiments.
They capture raw signals and settings from instruments like the Bruker EMX spectrometer.
These files store information about how electron spins react to magnetic fields and microwaves.
To view and analyze the contained data, you must use specialized software such as Bruker’s Xenon software.
Key details provided by FilExt.com include:

Data from ESR spectroscopy experiments.

Storage of raw signal values and experimental parameters.

Designed for use with Bruker hardware and associated software solutions.

FilExt.com note: For more information, you can visit the Bruker website.

How do you open ESR files?

You need a suitable software like Bruker's Xenon to open an ESR file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your ESR file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a ESR file directly in the browser:. Just drag the file onto this browser window and drop it.

Online ESR Text Viewer

Choose your .esr file to analyze

or drag and drop it here

Online File Viewer

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ESR file format:

Every file has a defined file format, i.e. how the data is arranged in the file. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our evaluation of the ESR files is as follows:

The ESR file extension is rather rarely used and mainly uses a defined ESR format. The file formats most commonly found in ESR files are:

• 75% of all ESR files use the same file format, which have the signature SAMPLE NAME . These files are text files, so they contain words and text. The files are 51 KB to 120 KB in size, with a median of 52 KB. This file type is new and state-of-the-art. The keywords COMMENT, DATE/TIME, SAMPLE NAME, SENSOR SERIAL NO, MICROWAVE POWER (mW), STARTING SWEEP FIELD (G), 3400.000000, 1332201ASI, ENDING SWEEP FIELD (G) and reducing are typical for these files. A usual file name is MS176 reducing 1 16_02 __20180601.ESR or MS158 reducing 2_2_23 __20180601.ESR. Files like these have the following tags: reducing, ascorbate, protocol, reduce, filt, more, pentanol, repeat and tempo.
• 4% of all ESR files have the same signature esr3. The contents of these files cannot be read by a human; only a computer program can interpret the data. The files are often between 1 MB and 9 MB in size. The following keywords are characteristic: esr3.

The remaining 21% of all ESR files are different files with different signatures. These files are often connected to resources, umtempol, hadgem or rack. Just click the "Choose your .esr file to analyze" button on this page to find out what your ESR file is.