Institut de Chimie Moléculaire et des Matériaux d'Orsay

Mass spectrometry



Mass service
Send an email

Send an email

Send an email

Build.: 410 groundfloor

Office: 01 69 15 47 65

Lab: 01 69 15 33 76

Information obtained

The mass spectrometry is an analysis technique that allows to identify molecules by measuring their mass and to characterize their structure.

According to the methods of ionization, we can obtain the mass and the molecular formula of molecule as well as structural information.

Which analysis for your sample ?

Electrospray (ESI) is used for polar and/or high molecular weight molecules.

The APCI is restricted to molecules of low polarity.

For apolar molecules and low molecular weigh gas chromatography is more advisable .

Here is a table to help you to choose :

ionization modes and applicable compounds-small.png

How to use 

Users send us by e-mail at a request to the mass service by completed the form below :

Download a spectra request form .


For ESI analysis you need to :

  • For stable molecule and m/z <1000

Book online with GRR:
- Go to ICMMO’s Intranet (French version)
- Click under "Réservations" on "Masse" (a new window opens, verify you are in "Plateforme technique" ; "Masse"; "ESI - routine")
- Use your ADONIS username and password to log in.
- Click on "+" to book (5 max/person/day) the order does not mean anything, book in in a successive way.
- Write the compound name in "Brève description" and choose your team above “Équipe”.
Do not change the other parameters (durée, domaine, type...).

Warning, One analysis = one reservation ! For exemple if you want to analyse your sample in positive and negative mode, you need to book 2 analysis.

Send us your analysis request form by e-mail in word or pdf to before 10:30am the day of the analysis.

Once completed, drop your sample (1mg) before 10:30am the day of the analysis. Drop your sample in the good drawer in the mass spectrometry entry hall.

If you drop your sample after 10:30am we could not analyse it.

  • For sensible molecule  (temperature, solvents, air...) and/or high mass (m/z >1000) and/or for organo-metallic chemicals

Please make an appointment at :


For APCI analysis you need to :

Please make an appointment at :


Reminder for all analysis :
Your analysis sheet must be fully completed, the sample's name must be written on the vial (2mL minimum).



Results :

For ICMMO's staff the results are available on the mass server (How to connect - French version).
The results are sorted by team. An automatic e-mail is sent when a new result is available in your personal folder. 

The samples to be collected will be available in the mass spectrometry entry hall, sorted by team.


External services possible :
Please make an appointment at :


Liquid chromatography coupling is possible.