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September 2020

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Subject:
Re: TAPJ, TAPH, TAPL or TAP?
From:
Andrew Locock <[log in to unmask]>
Reply To:
JEOL-Focused Probe Users List <[log in to unmask]>
Date:
Fri, 25 Sep 2020 14:38:07 -0600
Content-Type:
text/plain
Parts/Attachments:
text/plain (71 lines) 
Hello,
On our JEOL 8900R we have one TAPJ and two TAP crystals.
When we measure Si simultaneously on all spectrometers, the two TAP crystals have intensities within 2.5% of each other.
However, the TAPJ crystal has Si intensity 10 to 12% higher than the regular TAP crystals.

My understanding is that TAPJ refers to the Johansson geometry of the thallium hydrogen phthalate crystal.
Best regards,
Andrew

-----Original Message-----
From: JEOL-Focused Probe Users List <[log in to unmask]> On Behalf Of Cyril
Sent: September 24, 2020 9:11 AM
To: [log in to unmask]
Subject: Re: [PROBEUSERS] TAPJ, TAPH, TAPL or TAP?

Johansson crystals give better resolution over the entire spectrum but are more expensive due to the difficulty in manufacturing.
If I recall correctly, on one of my trips to the JEOL factory, they were hand lapped to get the correct curvature. So there was some loss due to breakage/damage.


Cyril Kirkland 

> On Sep 24, 2020, at 2:45 AM, Radek Michallik <[log in to unmask]> wrote:
> 
> Hi and thank you all for the quick reply.
> 
> Indeed, Johan vs Johansson crystals makes sense. Is not the resolution better with Johansson crystals? What is the benefit of the Johan geometry compared to the Johansson, then? Are they cheaper? More durable? 
> 
> Rgds,
> Radek
> 
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