the peaks ratio appear to be Sn rather than  Ca based on my  
recollection of the old eyes.
On Dec 10, 2015, at 9:01 AM, Bhanu Sood 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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