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Subject:
From:
Bhanu Sood <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Bhanu Sood <[log in to unmask]>
Date:
Fri, 11 Dec 2015 09:31:29 -0500
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Not sure that answers why there's Sn at 0.3keV

On Thu, Dec 10, 2015 at 12:23 PM, Vladimir Igoshev
<[log in to unmask]> wrote:
> I'm not worried about that particular one. There are 3 major in the spectrum, even though there are overlappings and not just with Ca
>
> Vladimir
>
> ---- On Thu, 10 Dec 2015 06:01:11 -0800 Bhanu Sood<[log in to unmask]> wrote ----
>  > Not sure why a Sn label appears at 0.3keV??
>  >
>  > As you know, there exist more than a few peak overlaps and Sn-Ca is
>  > classic, fyi.. CaKα 3.7keV, CaLα0.3, SnLα 3.4
>  >
>  > I recommend a rescan point and ID, much higher mag, and increase your
>  > accelerating voltage so you can look at binding energies in 10keV+ range..
>  >
>  > Bhanu
>  >
>  >
>  >
>  > On Wed, Dec 9, 2015 at 7:55 PM, Vladimir Igoshev <[log in to unmask]
>  > > wrote:
>  >
>  > > No underfill or any other fancy stuff
>  > >
>  > > ---- On Wed, 09 Dec 2015 16:53:28 -0800 Yuan-chia Joyce Koo<
>  > > [log in to unmask]> wrote ----
>  > >  > tin oxalyate used for epoxy catalyst... there were works for flux/
>  > >  > underfill one step stuff utilize flux by product as catalyst for
>  > >  > curing... (can't remember which group did that...)
>  > >  >           jk
>  > >  > On Dec 9, 2015, at 7:03 PM, Vladimir Igoshev wrote:
>  > >  >
>  > >  > > Hi Dave,
>  > >  > >
>  > >  > > Not really. It doesn't "burn" or "curl" much under the beam, so
>  > >  > > it's solid.
>  > >  > >
>  > >  > > Vladimir
>  > >  > >
>  > >  > > ---- On Wed, 09 Dec 2015 15:51:29 -0800 David
>  > >  > > Hillman<[log in to unmask]> wrote ----
>  > >  > >> Thank you Steve!
>  > >  > >>
>  > >  > >> Vlad - does the substance slightly charge in the SEM?
>  > >  > >>
>  > >  > >> Dave
>  > >  > >>
>  > >  > >> On Wed, Dec 9, 2015 at 5:46 PM, Steve Gregory <[log in to unmask]>
>  > >  > >> wrote:
>  > >  > >>
>  > >  > >>> Hi Dave and Vlad,
>  > >  > >>>
>  > >  > >>> I have it up here:
>  > >  > >>>
>  > >  > >>> http://stevezeva.homestead.com/What_else_it_can_be.pdf
>  > >  > >>>
>  > >  > >>> Steve
>  > >  > >>>
>  > >  > >>> On Wed, Dec 9, 2015 at 4:34 PM, David Hillman <
>  > >  > >>> [log in to unmask]> wrote:
>  > >  > >>>
>  > >  > >>>> HI Vlad - we can't open Dropbox here due to firewall
>  > >  > >>>> restrictions so can
>  > >  > >>>> you have Steve G. post the pictures?
>  > >  > >>>>
>  > >  > >>>> Dave Hillman
>  > >  > >>>> Rockwell Collins
>  > >  > >>>> [log in to unmask]
>  > >  > >>>>
>  > >  > >>>> On Wed, Dec 9, 2015 at 4:59 PM, Vladimir Igoshev <
>  > >  > >>>> [log in to unmask]
>  > >  > >>>>> wrote:
>  > >  > >>>>
>  > >  > >>>>> HI everyone,
>  > >  > >>>>>
>  > >  > >>>>> I'm attaching a link to a file showing something I'd appreciate
>  > >  > >>>>> your
>  > >  > >>>>> thoughts on. It's a cross-section of a QFN on an IAg board;
>  > >  > >>>>> Pb-free/no-clean process. As you can see from the EDS spectrum,
>  > >  > >>>>> that
>  > >  > >>>>> greyish stuff between pins has pretty much only Sn and O in its
>  > >  > >>>> elemental
>  > >  > >>>>> composition.
>  > >  > >>>>>
>  > >  > >>>>> I know there is burn flux residue around solder joints but that
>  > >  > >>>>> stuff
>  > >  > >>>>> doesn't have any C in it. The question I have is what is it.
>  > >  > >>>>>
>  > >  > >>>>> I spoke to Bev and both of us are still puzzled.
>  > >  > >>>>>
>  > >  > >>>>> Here is the link:
>  > >  > >>>>>
>  > >  > >>>> https://www.dropbox.com/s/3wbj62vqjyhvj2y/What%20else%20it%20can%
>  > >  > >>>> 20be.pdf?dl=0
>  > >  > >>>>>
>  > >  > >>>>> Thank you very much in advance.
>  > >  > >>>>>
>  > >  > >>>>> Regards,
>  > >  > >>>>>
>  > >  > >>>>> Vladimir
>  > >  > >>>>>
>  > >  > >>>>> SENTEC
>  > >  > >>>>>
>  > >  > >>>>>
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>  >
>  >
>  >
>  > --
>  > Bhanu Sood
>  > Tel: (202) 468-8449
>  >
>  > ______________________________________________________________________
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>  > ______________________________________________________________________
>  >
>
>



-- 
Bhanu Sood
Tel: (202) 468-8449

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