Data Quality

 

---

---

Data Quality Variables

Signal to Noise Ratio (S/N), Charge Control Quality, Energy Resolution, Transmission Function …..

 

 

---

---

 

Data Quality depends strongly on the Number of Scans which controls S/N

 

 

---

---

 

Data Quality depends on S/N as shown here, Charge Control settings, and Energy Resolution Settings

 

 

 

---

---

 

Energy Resolution versus Electron Count-Rate

 

By decreasing the Pass Energy value we get better energy resolution which allows us to separate and identify more chemical states.  Unfortunately the increase in Energy Resolution produces a much lower Electron Count-Rate.  A lower count-rate means that we must collect data for a longer time to get a useful S/N ratio.  This chart can be used as a guide that helps you decide if a smaller Pass Energy setting is worth the time used to get a useful S/N.

 

 

---

---