Search for articles on SPACs from an article database such as Business Source Complete. Also see the HBS Background Note: SPAC Space and Harvard Business Review article: SPACs: what you need to know. 

Additionally, LSEG Workspace, Pitchbook, Bloomberg, and and Capital IQ provide data on SPACs: 

In LSEG Workspace:

• Type 'screener' into the main search bar to load the Screener App.
• Change the Universe to Deals and the Asset Class should be M&A.
• In the text box where it says Add Filter, start typing in 'special' and select Is a Special Purpose Acquisition Vehicle, then select True, and click Done.
• Add other criteria as desired.

In Pitchbook, go to: 

• Screeners
• Investors & Funds
• Build a custom investors & fund screen
• Investor Types > Other investor types > Special purpose acquisition company (SPAC)

In Bloomberg, go to:

• IPO
• Advanced Search
• Offer Type
• Special Purpose Acquisition Company (SPAC)
• If downloading from Bloomberg is problematic, try cutting and pasting the results from the search, after adding a few relevant columns to the results table.

In Capital IQ, go to:

• Screening
  • All Idea Generation Screens
  • Enter SPAC in the Screens search bar to find their canned screen
• Notice that the logic in the Capital IQ screen is similar to that in the LSEG Workspace screen: look for issues that are to be used to finance acquisitions.