There are multiple ways to create ions for analysis via mass spectrometry. Under

Question

There are multiple ways to create ions for analysis via mass spectrometry. Understanding how the ions are created is essential in interpreting the mass spectrum produced. Two common methods of ionization are electron ionization and chemical ionization. Answer the following questions regarding these two types of ionization. Make sure to answer all three questions. Describe how ions are created via electron ionization.

There are multiple ways to create ions for analysis via mass spectrometry. Understanding how the ions are created is essential in interpreting the mass spectrum produced. Two common methods of ionization are electron ionization and chemical ionization. Answer the following questions regarding these two types of ionization. Make sure to answer all three questions Describe how ions are created via electron ionization o Analyte molecules are bombarded with high energy electrons (usually 70 eV), allowing the A reagent gas is converted to reactive species by energetic electrons. These new reactive MH+ species then donate a proton to the analyte molecules to produce the protonated molecule O alyt molecules are heated with microwaves until they absorb sufficient energy to ionize Analyte molecules are ejected from the solution phase to the gas phase. During this process the analyte molecules lose an electron causing ionization Analyte molecules are bombarded with protons that pull electrons away from the analyte molecules creating ions in the process

Explanation / Answer

1. Electron ionization is an ionization technique where an analyte is bombarded with the high potential electron beam to remove an electron from the analyte forming an ion. Therefore, option (a) which says that analyte molecules are bombarded with high energy electrons (70eV) allowing the molecules to absorb enough energy and ionize.

2. Chemical ionization involves the ionization of a gas molecule to protonate the analyte by H+ or H- transfer, therefore, option (d) which states "a reagent gas is converted to reactive species by energetic electrons. These new reactive species then donate a proton to the analyte molecules to produce the protonated molecule MH+.

3. Electron ionization produces the most fragmentation, therefore, option (b) is correct.

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