Adam Baggott

8 Questions 6 Answers 0 Followers

Questions related from Adam Baggott

What is the uncertainty in my Raman spectroscopy peak position measurement?

If I have a Raman device that has a spectral resolution of 1 cm-1 then what is the uncertainty associated with my peak position measurements? For instance, if I measure my peak-fitted peak...

08 October 2018 2,607 4 View

What is the best way of characterising grain size in a multiphase ceramic such as silicon nitride? XRD?

I am trying to find out the ratio of alpha to beta grains in a bulk (non-powdered) sample of silicon nitride as well as their size distribution. What technique is best for determining this...

26 March 2018 978 4 View

What is the escape depth of secondary electrons induced by an SEM?

I have read in the literature that secondary electrons (SEs) only escape from the top few nanometres (

12 March 2018 1,945 3 View

Does the plasma etching of ceramics (such as silicon nitride) to reveal the microstructure have an effect on the residual stress surrounding grains?

It is common practice to plasma etch a ceramic material in a barrel etcher in order to more clearly see the grain structure and intergranular phase. My question is, will the process change the...

07 March 2018 3,106 3 View

Is SEM secondary electron signal affected by residual stress?

I am observing a ceramic under SEM and have noticed that in some stressed regions the signal appears to be brighter. Now I recognise that these brighter regions may just be due to charging but is...

06 September 2017 1,668 5 View

What is the best way to clean a gold-coated SEM sample?

Hello there, So I have added a gold-conductive (via evaporation) layer to my bulk silicon nitride sample for use with SEM. Unfortunately the surface has become a bit dirty with dust and probably...

21 June 2017 8,398 3 View

Neon lines not showing on Raman spectra?

Hi there, I am trying to use a Neon pen-ray source to calibrate my Raman spectra against thermal/instrumental fluctuations. I have placed the Ne source at various distances from my sample but am...

17 May 2017 1,300 0 View

Does the slit diameter and hole size determine the laser spot size on the surface of a sample when using Raman spectroscopy?

Hi there, I'm using Raman spectroscopy to analyse the surface of my sample and need the laser spot size to be as small as possible. I'm using a 100x objective lens (the main determining factor of...

25 October 2016 1,875 1 View